fix(lang): fix small typo.
feat(compiler): initial version of the compiler.

Supports:
- binds text nodes, element properties and directive properties
- locates decorator, component and template directives.
- inline templates of components

The compiler is built using a pipeline design,
see core/src/compiler/pipeline package.

Integration tests to show how the compiler, change_detection and DI work
together:
core/test/compiler/integration_spec.js
feat(change_detection): add support for binary operations and literals
feat(change_detector): add support for formatters
feat(change_detector): add support for method calls
feat(change_detector): add support for negate
feat(change_detector): add support for ternary
feat(change_detector): add support for array literals
feat(change_detector): add support for map literals
feat(change_detector): cleanup