Implement Array#flatten
Implement Array#reverse_each
Make StaticTuple#at do the right thing if the tuple is empty.
Add String and Symbol#to_str.
Implement Dir#mkdir.
Implement Module#module_function.
Minor whitespace fixes.
File.dirname should return '.' if no more parts.
Implemented String#sub
Implemented chomp.
Implemented Regexp.escape
Added globalobj#include()...

I'm not sure if this is entirely right, but it does what I expect it to for now.
Moved class variable stuff to Module instead of Class.

Because setting class variables in a module is apparently a thing you can do.
Add defined?(::Constant) form.
Implemented placeholder for valias token.
newline in description string blows stuff up.
Add fail tags for rubyspec ci.
Run rubyspec in ci mode from travis.
Add time package to travis.yml
Disable 1.9.3 building as it crashes at the moment.