Travis doesn't support cmake version higher than 2.8.9.
Merge pull request #17 from ahmedcharles/travis_cmake

Travis doesn't support cmake version higher than 2.8.9.

We still backport to 2.8.11 but this will make it so those on lower Cmake versions can build error free.
Remove the extra T2DMap default constructor.

T2DMap currently has two default constructors, remove one.