Login: created an LoginFactory to open Modal Login dialog from every Controller, Homepage: login/out button always visible, Register button dissapears when logged in, Documentpage: Sign in button opens Modal Dialog, Register page: layout changes
Merge pull request #250 from thomasvanlankveld/master

add annotation button with selection, annotation sidebar styling
Merge branch 'master' of github.com:matijse/nulpunt into matijse-mater

Conflicts:
	http-files/html/document.html
bugfix DocumentViewer
Merge pull request #252 from matijse/master

bugfix DocumentViewer
styled comments, added dropshadow for "active highlights"