add new custom_search scopes

The scopes are added to `Department`, `Group`, `Person`, and `Service`.
added tests for new search scopes
changing alias search to use regular expression

changing alias search to use regular expression so that it ignores case
when searching.
Merge branch 'master' into add_search_scopes

Conflicts:
	spec/lib/buweb/group_spec.rb
	spec/lib/buweb/service_spec.rb
Merge branch 'master' into add_search_scopes

Conflicts:
	spec/lib/buweb/group_spec.rb
	spec/lib/buweb/service_spec.rb
Merge pull request #29 from biola/add_search_scopes

Add search scopes