improve the glib.cabal description
Fix documentation of glyphItemExtents

The ink and logical extents are actually returned in the opposite order by the
`glyph_string_extents` C function.

This commit changes the variable names to reflect their correct meanings, but
the function as a whole is unchanged (modulo alpha-equivalence), so no client
code should be impacted.
Merge pull request #55 from juhp/patch-1

improve the glib.cabal description
Merge pull request #57 from pcapriotti/master

Fix documentation of glyphItemExtents
Fix #46, fix #56 and bump glib version number
Add Functor and Applicative instances for GHC 7.10 compatibility
Bump version numbers
Merge pull request #62 from rwbarton/master

Add Functor and Applicative instances for GHC 7.10 compatibility
Bump gtk2hs-buildtools version number
Fix lower bound for bytestring