Add models EntryDoc, EntryHTML
Update relations Entry
Fix attribute name in entry_doc and entry_html: jahreszahl -> jahreszahlen
Add import_doc_from_html task
Add import_entry_doc_helper implementing import_entry method
Add import_entry_doc_helper_spec
Update import_html task: save lemmata as EntryHtml
Update import_html task: save lemmata as EntryHtml
Add page_reference to EntryDoc
Display html safe Entry.quellen, literatur, eigene_ergaenzungen, literatur_ergaenzungen and quellen_ergaenzungen in view
Revert "Update import_html task: save lemmata as EntryHtml"

This reverts commit 4abab69477beb17bb7d98593a3efa7a041c29df9.
Revert "Add page_reference to EntryDoc"

This reverts commit 76b4b1bc86c9ac234e878b253696a3d135c914f7.
Add import entry from doc and html task + helper and spec test
Remove user registration in devise model
Remove user registration in route.rb
Add helper method for converting kennzahl to scan pages
Use kennzahl for displaying correct scan pages