One race condition was already fixed, but another one exists when
writing by partition.

Author: Jim Crist <[email protected]>

Closes #1468 from jcrist/fix-race-condition-parquet-partition and squashes the following commits:

180c4a2 [Jim Crist] Fix race condition in write_to_dataset

…isibly to front page

There can be a fine line between what is an open source project and what is a company and what is a product or organization, so to keep things simple I have consolidated things into a single list without passing any judgments. I have also added a link to the Powered By page that is visible without digging into any menus on the front page

Author: Wes McKinney <[email protected]>

Closes #1465 from wesm/website-powered-by-simplify and squashes the following commits:

7c43e0b [Wes McKinney] Suggest adding to Powered By by pull request instead of e-mailing
9a61eed [Wes McKinney] Consolidate Powered By project list, add more visibly to front page

Author: Chris Bartak <[email protected]>

Closes #1466 from chris-b1/windows-cpp-devdoc and squashes the following commits:

0990ddc [Chris Bartak] remove python from cpp conda env
4dab8b0 [Chris Bartak] updates windows c++ env docs

I took a swing at improving the CopyBitmap performance (benchmarks below).  I'm a C/C++ novice, so I thought I'd get some feedback before I went too much further.

**Starting Point**
```
Run on (4 X 2208 MHz CPU s)
12/13/17 21:15:18
Benchmark                                        Time           CPU Iterations
------------------------------------------------------------------------------
BM_CopyBitmap/97.6563k/0/min_time:1.000       4779 us       4758 us        289   20.0445MB/s
BM_CopyBitmap/976.563k/0/min_time:1.000      47740 us      47476 us         26   20.0875MB/s
BM_CopyBitmap/97.6563k/4/min_time:1.000       4858 us       4866 us        289   19.5991MB/s
BM_CopyBitmap/976.563k/4/min_time:1.000      48117 us      47953 us         29   19.8879MB/s
```

**Using stanford bithacks for SetBitTo**
```
Run on (4 X 2208 MHz CPU s)
12/13/17 21:22:05
Benchmark                                        Time           CPU Iterations
------------------------------------------------------------------------------
BM_CopyBitmap/97.6563k/0/min_time:1.000       1647 us       1649 us        815   57.8415MB/s
BM_CopyBitmap/976.563k/0/min_time:1.000      16368 us      16397 us         81   58.1629MB/s
BM_CopyBitmap/97.6563k/4/min_time:1.000       1599 us       1610 us        815   59.2186MB/s
BM_CopyBitmap/976.563k/4/min_time:1.000      16026 us      16011 us         81   59.5644MB/s
```

**memcpy + shifting**
*This solution provides varying performance depending on whether or not the bit offset is a multiple of 8*
```
Run on (4 X 2208 MHz CPU s)
12/13/17 21:23:44
Benchmark                                        Time           CPU Iterations
------------------------------------------------------------------------------
BM_CopyBitmap/97.6563k/0/min_time:1.000          5 us          5 us     280000   18.9651GB/s
BM_CopyBitmap/976.563k/0/min_time:1.000         62 us         61 us      22400   15.1721GB/s
BM_CopyBitmap/97.6563k/4/min_time:1.000        171 us        170 us       6892   560.872MB/s
BM_CopyBitmap/976.563k/4/min_time:1.000       1639 us       1639 us        896   581.782MB/s
```

Author: Adam Seibert <[email protected]>

Closes #1422 from seibs/ARROW-764 and squashes the following commits:

c813c8e [Adam Seibert] ARROW-764: [C++] Improves performance of CopyBitmap and adds benchmarks

Hi, I just add the delete function for Plasma and tested. JIRA ticked:
https://issues.apache.org/jira/browse/ARROW-1927

Author: Jin Hai <[email protected]>
Author: Philipp Moritz <[email protected]>

Closes #1427 from JinHai-CN/plasma-delete and squashes the following commits:

c6df5be [Philipp Moritz] rebase
424c1b7 [Philipp Moritz] fix linting
1d76437 [Philipp Moritz] fix tests
0ca115a [Jin Hai] Fixed two bugs according to the comments
ce27077 [Jin Hai] Update the unit test cases
8b6804e [Jin Hai] ARROW-1927: [Plasma] Try to fix unit-test fault
be88990 [Jin Hai] ARROW-1927: [Plasma] Add 3 test cases for delete function
baf82b9 [Jin Hai] ARROW-1927: [Plasma] Update according to the CI error
53e24eb [Jin Hai] ARROW-1927: [Plasma] Update according to the comments and CI error
c9984a4 [Jin Hai] ARROW-1927: [Plasma] Add delete function

Moving pandas register into default register.

Author: devin-petersohn <[email protected]>

Closes #1462 from devin-petersohn/jira/1971_pandas_serialization and squashes the following commits:

b3dfd5b [devin-petersohn] Removing slower codepath
2ed3137 [devin-petersohn] Moving pandas register into default register

Also fixes [ARROW-1903](https://issues.apache.org/jira/browse/ARROW-1903)

Author: Paul Taylor <[email protected]>

Closes #1471 from trxcllnt/fix-js-es2015-builds and squashes the following commits:

62db338 [Paul Taylor] update dependencies and add es6+ umd targets to jest transform ignore patterns to fix ci
6ff18e9 [Paul Taylor] ship es2015 commonJS in main package to avoid confusion
74e828a [Paul Taylor] fix typings issues (ARROW-1903)