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

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

Use other types of graphical objects

The previous version uses only simple paths this commit makes it possible to
add other objects like circles, rectangles and text. The refactoring
is the first part of the full SVG implementation.

White space fixes

Set units per em in export settings

Generate Mac specific TTF fonts
This should fix the fontbook issue

Generate mac specific truetype fonts

Add abstract table class

Fix memory leaks

Save, export and load fonts in background threads

Move progress indicator to tab bar

Show progress bar while loading big font files

Remove some code that needs speed optimization

Efficient parsing of the kern table

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

log export to file

version 0.28

menu items for removing kerning classes

Kerning by classes
This implementation uses the PairPosFormat1 to store kerning values in
TTF files and has a new kerning display that allows the user to define
kerning classes.

Some code to do PairPosFormat2 is included as well but it seems like
the PairPosFormat1 is the better solution.

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

4096 units per em

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

mac issues, including a more permissive license for libbirdfont

Subdirectory for open font format tools