[TEST,FIX] Fixing test helper module seqan.app_tests.
Merge pull request #205 from holtgrewe/hotfix/app_tests_py

[TEST,FIX] Fixing test helper module seqan.app_tests.
Merge pull request #212 from weese/fix/test_index_stree_iterators

[FIX] hotfix for stree iterators on empty string sets
Merge pull request #214 from weese/master

Disable OpenMP warnings for travis and clang