fetach(newpage): After create page the new page is visible in pagelist wihtout refresh
feat(deletepage): new route to delete a page

- new route in app.js defined
- new function in pagerequesthandler for the new route
- new function deletePage in githubContentProvider
feat(deletepage): Added client functionality to delete the page
feat(deletepage): Remove the deleted page from pages

The deleted will will now also be removed from $rootScope.pages