Changed links to reflect the new .io domain for Github pages.
Merge pull request #17 from zachlatta/patch-1

Changed links to reflect the new .io domain for Github pages.
Correcting type (missing ":" in explanation of "$:.unshift")
Merge pull request #18 from davidrupp/patch-1

Correcting type (missing ":" in explanation of "$:.unshift")
add note about named arguments
fix unshifts
crap, these should not have been committed.
Fix typos in Prologue.
Merge pull request #20 from perryh/patch-1

Fix typos in Prologue.