MAINT: simplified comment about build type.
MAINT: simplified unit-test-program-names.
FIX: added the right executable name to add_test.
Merge pull request #41 from DO-CV/maint-simplify-unit-test-program-names

[MAINT] Simplify unit test program names.
Merge remote-tracking branch 'origin' into maint-cmakelists-txt
Merge pull request #42 from DO-CV/maint-cmakelists-txt

[MAINT] Add possibility to choose build types in `CMakeLists.txt`.
MAINT: add gmock to third-party software.
Merge pull request #43 from DO-CV/enh-add-third-party-gmock

[MAINT] Add gmock to third-party software.
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`.