made searching for members in role management case insensitive (#40)
added model for searching (issue #4)

searching for members by full_name, nick and email
member_factory now has incremental emails and nick to avoid uniqueness errors
Merge branch 'master' of github.com:kir-dev/simonyi-cimtar into search

Conflicts:
	app/controllers/admin/roles_controller.rb
searching for jobs (#4)

searching in company names
search is case insensitive and search for parts of the words
searching for groups (name or shortname) [#4]