allow linking libc++ as well as libstdc++ (needed for easier installation on OS X)
strawman newtyped ExceptT to allow transformers 0.3
Revert "allow linking libc++ as well as libstdc++ (needed for easier installation on OS X)"

This reverts commit 642d3dcad5084af43acfd5e7ec7cacf39c3545d5.
change up import qualification plus remove extraneous whitespace
making language pragma match suggested style
space after =
space before ->
change Ext qualification to Except qualifier
fixup large deriving clause style
really big comment explaining when to revert this whole pull request in ~ 1 ish years.
rename getExceptT to unExceptableT (hat tip to bscarlet for thatn more than exceptable suggestion)
woopsie, missed a spot in the getExceptT vs unExceptableT
... that was unExceptable!
fixed up language pragma style in Exceptable module
Merge pull request #121 from cartazio/allow-older-transformers

internal api preserving refactor to Allow older transformers