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* Control.Monad.Error.Class: add tryError, withError, handleError, mapError (resolves #60)

Re-export evalCont/evalContT

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This commit was performed automatically by a script.
https://github.com/RyanGlScott/travis-maintenance

This commit was performed automatically by a script.
https://github.com/RyanGlScott/travis-maintenance

This commit was performed automatically by a script.
https://github.com/RyanGlScott/travis-maintenance

* Try out omit-local-package

* Try to fix 7.8.4 job

* Typo: - vs =

This reverts commit 15278af4.

This reverts commit 6f33b336.

Documentation fix: MonadFoo instead of StateFoo

Improve "first contact" aspect in README file

Added:

* Synopsis/header
* Structure
  * Lifting
  * Transformers
* Resources

This avoids relying on the fragile "safe-inferred" status
and thus gives `mtl` a more explicit SafeHaskell API contract.

C.f. https://github.com/haskell/pvp/issues/22