Implement nx.Mapping
Add nx.Mapping support to data bindings
Add nx.Mapping::inverse method
Add nx.Mapping inversionfor two-way bindings
Remove nx.Property 'set' option
Use call method for invoking nx.Event handlers
Add node_modules to .gitignore
Add package.json for node.js dev dependencies
Add Gruntfile with jshint task
Add build dir to .gitignore
Remove non-functional 'use strict'; from source files
Add concatenated build for linting