Relax constraint on base dependancy to support GHC 7.4

GHC 7.4 will ship with base-4.5.0.0
Added flag instanceST that forces MonadBaseControl instances for the ST monad to be exported.
Depend on transformers-base >= 0.4.1
Bumped version from 0.3.0.1 to 0.3.1
I should actually bump the version to 0.4
because of the added instances for ST.
However, I think no one will be affected by this.
Fix typo of criterion in description
Merge pull request #7 from juhp/patch-1

Fix typo of criterion in description
Relax dependency on transformers.
Bump version to 0.3.1.1.
Merge pull request #8 from hesselink/master

Relax dependency on transformers
Fix issue #9. Replace all Unicode in type variables.
Added a Trustworthy flag
Merge branch 'master' of github.com:basvandijk/monad-control
Bumped version from 0.3.1.2 to 0.3.1.3 because of an internal change
Compatibility with ghc head
Bumped version from 0.3.1.3 to 0.3.1.4 because of bumped dependencies
Added defaultLiftWith and defaultRestoreT to simplify defining MonadTransControl for newtypes.
Renamed x to run
Added CONTRIBUTORS file
Bumped version from 0.3.1.4 to 0.3.2 because of API additions
Pull the latest changes from master