travis integration of gearshifft

[tdd11235813]

for travis integration of gearshifft you need:

• account on Travis CI
  • will be connected to your github login
• organization access of travis to mpicbg-scicomp
  • in travis go to your accounts page and if you cannot see your organization, then check "Review and add your authorized organizations." on the left side panel
  • you referred to github, where you, as a member, can grant access for travis to mpicbg-scicomp
• in travis on the accounts page -> organizations -> mpicbg-scicomp you can enable travis CI for gearshifft
• if it is enabled, then another commit on master is required to launch the travis build process (it looks for .travis.yml in the repo)
• after succeeded we can insert a status icon in the README.md:

  [![Build Status](https://travis-ci.org/mpicbg-scicomp/gearshifft.svg?branch=master)](https://travis-ci.org/mpicbg-scicomp/gearshifft)

[psteinb]

see #125