WIP: set up code coverage for Travis CI.
Reformatted lines in `CodeCoverage.cmake`.
Chmoded 644 `CodeCoverage.cmake`.
Merge remote-tracking branch 'origin' into enh-add-code-coverage
Added flags for code coverage.
FIX: don't force to build in Release mode.
Set up code coverage.
Cleaned master `CMakeListst.txt`.
ENH: added compilation flags for code coverage.
Merge pull request #44 from DO-CV/enh-add-code-coverage

[ENH] set up code coverage.