Fixed a folly issue.
Updated license e-mail.
Updated unit test CMake config.

  Changed e-mail addresses used in license.
  Removed `plugin_factory` test (it's empty anyway).

ISSUE #5
Updated logic for testing targets.

  Dropped invocation of `gcov`.

ISSUE #5
Merge branch 'feature/7-improve-plugin-support' into testing

* feature/7-improve-plugin-support:
  Updated logic for testing targets.
  Updated unit test CMake config.
  Updated license e-mail.