Start on parser module.
Cleanup parser a bit.
Started parsing commands.
Works with trailing whitespace
Expression no longer consumes colons.
Bit of cleanup and documentation. Fixes #216.
Merge branch 'master' of github.com:purescript/purescript into psci-fixes

Conflicts:
	psci/Main.hs
Updated for changes in prelude.
Document `:t` command.
Merge pull request #222 from joneshf/psci-fixes

Fix for #216