refactored headings and some links (shorter now) in admin views, added cucumber scenario for admin view to add categories
refactored add category view in admin area, adjusted test case/cucumber scenario accordingly
added category factory
finished translation and minor improvements the category admin views including the edit certain category button and view
added test cases for start page
Merge remote-tracking branch 'saheba/cucumber_and_rspec' into cucumber_and_rspec

Conflicts:
	features/navigation.feature