Merge 2.14 with master

Create versions of glyphs in order to support multi-master fonts

White space fixes

Save stylistic alternatives to bf fonts and make gsub features optional

Fix memory leak

Debug memory leak

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

Merge branch 'master' of /home/johan/birdfont-android/../birdfont

Create a database for fallback fonts

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

Conflicts:
	libbirdfont/BirdFontFile.vala

Adjust glyph size in overview

Add images to background selection tab

Fix the drive letter bug on Windows

Add contextual ligatures to the GUI and fix directory privileges

Add ligatures to the bf file format.

Remove git support for 1.0

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

Compile with libgit2

Spacing classes
Update side bearings and all kerning pairs for one or more glyphs
at the same time.

Create Git repositories for bfp files

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

Delete bfp file when glyphs are removed from the font

Rename GlyphBackgroundImage to BackgroundImage

Save, export and load fonts in background threads

Build on Windows