Relax text package constraint to permit 1.2.x.

Ignore-this: e2991f8cfa4ba0539c727489ce966df0

darcs-hash:20141021221534-4d2ae-94d471a97731903d6fa48be4fc63488a38081277
Fix crash on double cleanup of GL canvas back-end.

Ignore-this: a3dc86a4edc810dabcc537500551c1bd

darcs-hash:20141021224229-4d2ae-0e4d8a48d267d5c8fe346a5f321463cdf1f9e9da