SimpleCov added

SimpleCov is a code coverage analysis tool that generates awesome reports after running our test suite.
Fix indentation
Merge to method calls into one
Fix code by removing all unnecessary parentheses
Remove unnecessary nil protection
introduce gemset-specific simplecov filters

This also includes a SharedHelper to share
some settings between test_helper and spec_helper.
More filters for SimpleCov added

config, spec und test directories filtered
Groups for SimpleCov added
Coveralls added
allow local coverage generation w/o coveralls

When coveralls is not used (rake task) we should
still generate local simplecov reports.
Only load Coveralls if its rake task is invoked
should fix #601
Merge pull request #668 from ontohub/simplecov

Integration of Coveralls.
Merge pull request #654 from ontohub/601-some_repositories_are_not_listed

Show correct repository count, fixes #601.
Add ontology search controller spec
Merge branch 'staging' of github.com:ontohub/ontohub into develop
Merge branch 'staging' into 521-adding_feature_selectors_in_ontology_search
Merge branch '521-adding_feature_selectors_in_ontology_search' into develop
Merge branch 'develop' into develop.ontohub.org