Currently, we don't use any preset. This cause error messages like
when a helium package imports another packages which include es6+ syntax.

```
SyntaxError: Unexpected token import
    at helium.service.js:36
    at angular.js:10973
    at processQueue (angular.js:15552)
    at angular.js:15568
    at Scope.$eval (angular.js:16820)
    at Scope.$digest (angular.js:16636)
    at Scope.$apply (angular.js:16928)
    at done (angular.js:11266)
    at completeRequest (angular.js:11464)
    at XMLHttpRequest.requestLoaded (angular.js:11405)
```

- https://github.com/1ambda/zeppelin-advanced-transformation/blob/master/examples/example-highcharts-columnrange/index.js#L3
- https://github.com/1ambda/zeppelin-advanced-transformation/blob/master/index.js#L11

[Improvement]

* [x] - Install required NPM packages
* [x] - fix babel configuration

[ZEPPELIN-2166](https://issues.apache.org/jira/browse/ZEPPELIN-2166)

- Should be able to bundle existing helium vis
- Should be able to bundle https://github.com/1ambda/zeppelin-advanced-transformation/tree/master/examples/example-highcharts-columnrange

NONE

* Does the licenses files need update? - NONE
* Is there breaking changes for older versions? - NONE
* Does this needs documentation? - NONE

Author: 1ambda <[email protected]>

Closes #2071 from 1ambda/ZEPPELIN-2166/fix-webpack-config-for-es6 and squashes the following commits:

40f6b51 [1ambda] fix: Update babel configuration

(cherry picked from commit 2520555)
Signed-off-by: Lee moon soo <[email protected]>

### What is this PR for?

Helium package should be able to import css. For example,

- Someone want to create spell using jsoneditor (https://github.com/josdejong/jsoneditor/blob/master/docs/usage.md). In this case, he/she should import css

```js
import 'jsoneditor/dist/jsoneditor.min.css' /** here */
import JSONEditor from 'jsoneditor/dist/jsoneditor.min.js'
```

<br>

**This PR is written based on #2071, so the duplicated commit will be dropped. Please review the commit 505c7db only.**

### What type of PR is it?
[Improvement]

### Todos
* [x] - denote required packages in `package.json`
* [x] - setup `webpack.config.js`

### What is the Jira issue?

[ZEPPELIN-2191](https://issues.apache.org/jira/browse/ZEPPELIN-2191)

### How should this be tested?

Should be able to bundle [zeppelin-json-spell](https://github.com/1ambda/zeppelin-json-spell)

### Screenshots (if appropriate)

NONE

### Questions:
* Does the licenses files need update? - NO
* Is there breaking changes for older versions? - NO
* Does this needs documentation? - NO

Author: 1ambda <[email protected]>

Closes #2077 from 1ambda/ZEPPELIN-2191/import-css-in-helium-pkg and squashes the following commits:

d7768ee [1ambda] fix: Import css globally in helium package

Currently, we don't use any preset. This cause error messages like
when a helium package imports another packages which include es6+ syntax.

```
SyntaxError: Unexpected token import
    at helium.service.js:36
    at angular.js:10973
    at processQueue (angular.js:15552)
    at angular.js:15568
    at Scope.$eval (angular.js:16820)
    at Scope.$digest (angular.js:16636)
    at Scope.$apply (angular.js:16928)
    at done (angular.js:11266)
    at completeRequest (angular.js:11464)
    at XMLHttpRequest.requestLoaded (angular.js:11405)
```

- https://github.com/1ambda/zeppelin-advanced-transformation/blob/master/examples/example-highcharts-columnrange/index.js#L3
- https://github.com/1ambda/zeppelin-advanced-transformation/blob/master/index.js#L11

[Improvement]

* [x] - Install required NPM packages
* [x] - fix babel configuration

[ZEPPELIN-2166](https://issues.apache.org/jira/browse/ZEPPELIN-2166)

- Should be able to bundle existing helium vis
- Should be able to bundle https://github.com/1ambda/zeppelin-advanced-transformation/tree/master/examples/example-highcharts-columnrange

NONE

* Does the licenses files need update? - NONE
* Is there breaking changes for older versions? - NONE
* Does this needs documentation? - NONE

Author: 1ambda <[email protected]>

Closes apache#2071 from 1ambda/ZEPPELIN-2166/fix-webpack-config-for-es6 and squashes the following commits:

40f6b51 [1ambda] fix: Update babel configuration

(cherry picked from commit 2520555)
Signed-off-by: Lee moon soo <[email protected]>

### What is this PR for?
CI build is failing on `branch-0.7`. This PR cherry-pick some necessary commits from

#2003
#2081

and a commit (3ae8760) fixes changes made by #2071 for branch-0.7.

### What type of PR is it?
Hot Fix

### Todos
* [ ] - Make CI green

### How should this be tested?
See if CI becomes green

### Questions:
* Does the licenses files need update? no
* Is there breaking changes for older versions? no
* Does this needs documentation? no

Author: Lee moon soo <[email protected]>

Closes #2103 from Leemoonsoo/fix-branch-0.7-ci and squashes the following commits:

9539c9b [Lee moon soo] Try start and terminate spark context after each test class
f077980 [Lee moon soo] Correct test implementation with Authentication Enable
0eefb66 [Lee moon soo] Handle multiple Set-Cookie headers
8cfc5f9 [Lee moon soo] Remove unnecessary assert
d4a8807 [Lee moon soo] helium.bundle.js -> vis.bundle.js
9b6ec4a [Lee moon soo] create zeppelin-web/dist directory for test
129b40f [Lee moon soo] reduce build time
7d9489b [Lee moon soo] Reduce log