Merge garyb's changes to the Prelude
Merge pull request #208 from joneshf/psci-fixes

Psci fixes
Removed extra let.
Merge pull request #209 from joneshf/master

Removed extra let.
Added myself to authors.
Merge branch 'master' of github.com:purescript/purescript
Process os stuff better.
Check win64 aswell.
Remove debugging line.
Cleanup.
Sorted all compleitions.
Tilde expansion works.