Merge pull request #118 from latin-language-toolkit/styling

Styling of tabset
Reenable navigator
Fix prev and next handling in navigator
Add goToFirst and goToLast
Add navigator.goTo() logic
Add sentenceList directive
Enable navigator to switch between list and editor
Add some containers for editor and list
Temporary hack to bring up the sentence list
Styling of sentence list
Add sentence directive
Use newest main template in staging