Add .hsenv to .gitignore.
Expose LiquidHaskell Prelude, List modules for users to include.
Merge pull request #67 from leepike/master

update gitignore; export LH Prelude, List modules. (Great! Thanks Lee!)
Add other modules in the Cabal file to prevent strange linker errors when including library modules.
Merge pull request #68 from leepike/master

Added "other-modules" to cabal file. Thanks!