Add core template.rb for the basis of template libraries for opal
v0.3.37
Update to newest opal-spec
Pass Opal variable directly into each top level function scope
Fix bug in arguments for zuper calls (super with no args/parens)
opal/core.rb is now depreceated
Code cleanup in core/array.rb
Cleanup various pieces of corelib code
Clean up parser chain for opal-parser
Correct error in code overview in README.md
Hash can now use any ruby object as a key
Added Enumerable#group_by with specs
Array#fill implementation with specs
Enumerable#each_slice implementation with specs
Array.try_convert
NilClass#to_h
Module#undef_method
Classes and Modules native toString() should use their #name method
Proc#[]
Add some missing specs for variable assignments