Do not use exact version when building a branch with Travis CI (#13)
Do not use exact version when building a branch with Travis CI (#13)

Do not use exact version when building testing a branch with Travis CI

Jenkins use a merge commit that cannot be installed with pip
to test pull-requests, for instance:

  pip install \
    'git+http://github.com/tristan0x/hpcbench@820bf2b#egg=hpcbench'

produces the following error:

fatal: reference is not a tree: 820bf2b27d86d4fdd657a8e461f4183dc

This patch force to retrieve the master version in this case.

tristan0x/hpcbench,tristan0x/hpcbench,tristan0x/hpcbench