Create a backup every time a font is saved

Use .birdfont as default file extension instead of .bf

Cancel save as operation

Merge branch 'master' of github.com:johanmattssonm/birdfont

Merge branch 'master' of github.com:johanmattssonm/birdfont

Ensure that active paths are unique

Don't add saved filed to recent files

The security scoped bookmark doesn't seem to allow the user to open a file
for reading if the intent was created for writing a file. This commit
makes sure that files opened for writing won't be added to the recent files
list.

White space fixes

Fix dialog layout and set absolute path when saving fonts

Fix overwrite dialog

Overwrite dialog

Merge branch 'master' of github.com:johanmattssonm/birdfont

Lock for blocking background process

Remove stroke code settings
Fix compiler warnings

Merge branch 'master' of gitorious.org:birdfont/birdfont

Conflicts:
	libbirdfont/BirdFontFile.vala

Only store files lodad from the GUI in recent fonts

Add debugging symbols

New file chooser & keep expanders open

Save, export and load fonts in background threads