Added the regexp-grid example to the main cabal file
Merge branch 'master' of github.com:ekmett/ersatz
Added sudoku to the main package. Added `cabal install -f-examples` to disable example builds.
Added Johan's license to the main LICENSE file
Use other-modules to name the modules from each of the examples
Remove example-specific packaging and licensing

Now that the examples are integrated to the main build instead of just
hanging along for the ride in a subdirectory, make them a part of the
project for real.
regexp-grid Main: Specify an export list
Prefix the example executable names with ersatz-