Rename sbixBitmapHeader... to sbixGlyphHeader...
Move graphicType padding into Glyph.__init__
Revert "Use ast.literal_eval to implement safeEval"

This reverts commit f5d123be5e342d91c2fa964ddae2844bc633d08e.

Fixes https://github.com/behdad/fonttools/issues/164
See issue for details.
Merge branch 'master' of https://github.com/fontfont/fonttools

# By Jens Kutilek (13) and Behdad Esfahbod (1)
# Via Jens Kutilek (3) and Behdad Esfahbod (1)
* 'master' of https://github.com/fontfont/fonttools:
  Revert "Use ast.literal_eval to implement safeEval"
  Move graphicType padding into Glyph.__init__
  Cleanup
  Use safeEval for attributes
  Dump sbix flags as a bit field
  Pad graphicType if len() < 4
  Rename Bitmap to Glyph
  Renamed imageFormatTag to graphicType
  Nicer names
  Renamed bitmaps to glyphs
  Rename self.bitmapSets to self.strikes etc.
  Rename sbixBitmapHeader... to sbixGlyphHeader...
  Renamed sbixBitmapSet... to sbixStrike...
  Renamed BitmapOffset to GlyphDataOffset