Fix #569

Changes proposed in this pull request:

• Rename package name mvs_eland to multi-vector-simulator in setup.py
• Fix failing tests/test_A0_initialization.test_user_defined_output_path
• Rename src/mvs_eland to src/multi_vector_simulator
• Rename repository from mvs_eland to multi-vector-simulator
• Remove unused function mvs_eland.utils.get_version_info
• Refactor modules calls (mvs_eland. is replaced by multi_vector_simulator.)
• Update README.md and CONTRIBUTING.md replacing mvs_eland or mvs-eland by multi-vector-simulator

Action done for services

• coveralls.io: went into setting page and clicked on the "SYNC" button under the "Resync with github" section

• travis: visited profile page and clicked on the "SYNC ACCOUNT" below my profile picture

• readthedocs: created a new project because the docs of mvs_eland was based on @smartie2076's initial repository

The following steps were realized, as well (if applies):

• Update the CHANGELOG.md
• Apply black (black . --exclude docs/)
• Check if benchmark tests pass locally (EXECUTE_TESTS_ON=master pytest)

_{For more information on how to contribute check the CONTRIBUTING.md.}