Fix warnings

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

Merge ../birdfont-2.x

Fix kerning classes

Merge branch '2.x' of github.com:johanmattssonm/birdfont into 2.x

Merge ../birdfont-2.x

Fix spacing classes

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

Remove unused variables

Fix offsets in text rendering, release freetype resources on error and
switch themes.

Faster rendering of fallback fonts in the overview tab

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

More speed optimizations in the overview tab

Speed optimizations for the overview tab

This is done by caching labels and creating an array that stores the
length entire lenght of the set at all unicode ranges in GlyphRange.

The current version runs in a single thread but some work has been done
in order to render overview glyphs in a background thread.

White space fixes

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

Initialize overview

Thread safety in text rendering

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

Conflicts:
	libbirdfont/BirdFontFile.vala

Dark theme and a separate tool box for the overview tab

Write and parse ligature subsitutions in GPOS table

Add unassigned glyphs (ligatures) to ttf fonts and kerning tab.

XML escape sequence for font name in bf files

Undo for deleting items in the kerning list

Build on Windows