Ports the builtins acceptance tests from handlebars
Renames PartialContext to PartialResolver
Renames HelperContext to HelperResolver
Makes pending specs fail as soon as they are working
Merges PathNode and CallNode into one
Changes runtime to handle new CallNodes
Previously pending spec is not working properly
Fixes several mistakes in the ported basic acceptance tests
Properly handle path lookups
Adds support for @first and @last in each helper
Fixes spec that checks the use of @key in the each helper