Fixes for issue #51 visible on some systems.
For example crashes (segv) occurred on:
- One of the automatic tests
- Calc example
Merge pull request #1 from Sabst/issue#51

Fixes for issue #51 visible on some systems.
Merge pull request #52 from Sabst/master

Fixes for issue #51 visible on some systems.
More details in the README file
Basic Travis-CI build without GMock and CppSpec