Remove debugging print statement
Changes to template tester: make the intro text into placeholder text and remember the last template entered during the calibre session.

See http://www.mobileread.com/forums/showthread.php?p=2917642
Merge branch 'master' of https://github.com/cbhaley/calibre
Ensure builtin fonts are only loaded once
Fix regression that caused calibre running in debug mode on OS X to not have a menubar or dock icon