Use correct variable if peekWord8 successfully prompts for input

This fixes gh-74.

--HG--
extra : amend_source : 35ac4b4bb240824f15ce241071b7d340477aca55
Bump version to 0.12.1.1
Drop legacy #ifdef for GHC 6.x
Correctly track capacity when initial buffer is empty

This fixes gh-75.
Bump version to 0.12.1.2
Add a test for gh-75
Merge
Explicit imports
Fix stupid compiler warning
Merge branch 'master' into better-errors

Conflicts:
	attoparsec.cabal