New application upload command introduced

 - now you can upload entire directory into storage. All you need - is to specify manifest located in uploaded directory or subdirectories.

 Example:` cocaine-tool app upload2 ~/mock_repo/repo_echo/`
Bash completion for `upload2` action updated
Bash completion for `call` action updated
Docstrings added
Merge branch 'master' of github.com:cocaine/cocaine-framework-python