Bump version to 2.5.5
Bump version to 2.5.6
Bump version to 2.6.0
Bump version to 2.6.1
Bump version to 2.6.2
Disable garbage collection support
Bump version to 2.6.4
Enable garbage collection supported for OS X < 10.8

Set GCC_ENABLE_OBJC_GC to supported for builds with OS X 10.5, 10.6, and
10.7 SDK.

This fixes issue #131 "upgraded to 2.6.4 - pref pane is 32-bit all of a
sudden" reported by @tessus
Merge branch 'osxfuse-2'
Default to release version as preference pane version