Add update option for an existing installation
Load python 2.7 by default
Skip set up if the option is update
Added update option description
Travis has fixed issue #155
No, it wasn't fixed...
Travis-CI has fixed issue #155
Fixes issues with fabric connection to vagrant VM. Install ubuntu 64 bits instead of 32. Thanks @dargorr for the feedback!
Patch for issue #155 in travis-CI
Merge pull request #6 from guillermo-carrasco/develop

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