Merge pull request #171 from orbitfold/master

Fix issues when using clang compiler (issue #170)
fixes added for clang compile on mac
Merge pull request #174 from wkerzendorf/montecarlo/fix_maccompile

fixes added for clang compile on mac
adding clang to the TRAVIS testing suite
Fix a few problems in cmontecarlo.c
Forgot to fix macro_atom
Merge branch 'master' of https://github.com/orbitfold/tardis