Merge pull request #8 from PSPDFKit/vic/sig-revisions

Viewing signature revisions
Add new example
formatting
log extracted text
Update header for 2014
Restore original document
API update
Add second image example
comment
Improve support for view controller based status bar appearance.
Update status bar handling
Improve example
Update to 3.3.0
more elegant code
Fixes iOS 7 bug related to UISearchBar.
Improve example speed
create lazily
delay controller creation
clean up
Add new example