change root to home#index

because we need now the show for a page after signup
the landing_page will now home#index
introducing new home#show
add test for to_s method of entity_group
CSP Headers modified

should solve #381
adding constratins and indices to Entity_groups
tests are green again
change files according to the pullrequest #805
using find instead of where to raise an error if entities could not be found
refactoring according to pull request

adding missing space in mehtod call
introduce after sign-up
introducing after signup page

using locales for complete content
Merge branch 'staging' into 343-display_icon_type_category_projects

Conflicts:
	public/static/gwt/ontohub.nocache.js
Recompile GWT code
correct indetation
catching more specific exception
require ontology-united

This gem should allow us to write ontologies
for testing purposes in a small dsl.
adjust spec helper for ontology testing dsl

Add a more generalized helper method to get a version
for a file (needed for ontology-united interaction).

Include the Convenience module for ontology-united
interaction.
add a spec for referenced ontologies

This utilizes the testing ontologies DSL
(provided by the ontology-united).
fix file-extensions stubbing through :each

Stub file extensions on each spec run.
stub file extensions for all tests