Unit testing

[RopoMen]

1. Add Karma coverage
2. Test all parts of the module, including configuration (provider)
3. Remove tests which are only testing LoDash methods, why we should test those? (LoDash has its own tests)
4. Add only coupleof tests which ensure that parameters are passed correctly to the LoDash methods.
5. Check if AngularJS has some other buildin filters which should be wrapped + check that current wrappers (min,max) are relevant.
6. Check that ngFilterSpec.js is testing those wrapped filters also and those tests are passing.