improve url validation by using the ext5 regexp
improve url validation by using the ext5 regexp

problem with the old one was that it didn't include ^ and $.
adding that somehow triggered endless loops

Adding the ExtJS 5 regexp (back from the future) should fix all problems we have.

yacon/koala-framework,nsams/koala-framework,Ben-Ho/koala-framework,nsams/koala-framework,Sogl/koala-framework,Sogl/koala-framework,yacon/koala-framework,kaufmo/koala-framework,Ben-Ho/koala-framework,kaufmo/koala-framework,koala-framework/koala-framework,koala-framework/koala-framework,yacon/koala-framework,nsams/koala-framework,kaufmo/koala-framework