Added API for Relations

Fixes #93

Conflicts:
	spec/factories/relation_factory.rb
	spec/factories/relation_type_factory.rb
	spec/spec_helper.rb
add italian translation

Fixes #91
Update fontawesome icon name

Fixes #90
Bump to 2.4.0.beta
Add require for sass/rails to fix font-awesome missing error
Do not require the factories again in spec_helper