Msl-package-manager

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- add **update** command
- run pip commands using sys.executable

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- split requirements.txt using ``\n`` instead of by any white space
- remove unnecessary "import time"

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- show help message if no package name was specified for "create" command
- remove unused 'timeout' argument from test_envs.py
- reorganize if-statement in "list" command to display "Invalid request" when appropriate

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- separate **install**, **uninstall**, **create** and **list** functions into different modules
- fix MSL namespace
- edit test_envs.py to work with colorama and update stdout in real time
- add ``--yes`` and ``--release-info`` flags for CLI
- create documentation and unit tests
- many bug fixes

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- initial release