Create Chanko version 2.0.0 with big refactoring
Add default rake task to execute rspec for travis ci
Cancel using new hash syntax of Ruby 1.9+

This lines were generated by rails.
Cancel using Proc#=== for Ruby 1.8- compatibility
Fix typo
Remove unused configuration
Check if the context has view paths in invoking Function

The context may by neither view nor controller, but a normal context.
Fix symlink directory name from "unit" to user defined
Remove UnitNotFound exception class

to pass the raw exception object to ExceptionHandler.
This improves debug information.
Fix problem that the unit may be false
Improve README
Merge branch '2.0'