fixing null and undefined lookup

pre-commit hook refactoring, closes #432

Added `-v` option to CLI, bugfix for rendering `Number` when it was the
context, and specified files in package.json for cleaner `npm install`.

Specifying files in package.json

Good npm citizens should specify which files a npm module consists of
so module users dont have to download all the unnecessary things.

Bugfix for number rendered as [object Object]

+ minor fix for better error message when running specific render test

Fixes #415

CLI: -v option for displaying current version

Fixes #431

Created command line tool

Improve documentation to explain that Inverted Sections uses falsy

CLI used to render a mustache template with a data view, writes the template into stdout when successfull. Otherwise meaningfull errors into stderr.

Fixes #424

run jshint before tests, support of node back to v0.6

- Documented required version of npm while developing
- Use the latest npm client for node >= v0.8 on travis

Special quirks to get node v0.6 supported:
	- npm client v1.3.26 on travis
	- jshint 2.4.4 as >= 2.5.x breaks

Cleanup tests section in readme

Refactor Writer.renderTokens() for better readability.

Split the old Writer.renderTokens() into several small functions with a single responsible.

added pre-commit hook and hook installer, resolves #401

an image is wroth a thousand words

Conflicts:
	package.json

Section with "length" property

changed mocha reporter to spec and bumped mocha version, solves #403

Also run node v0.11 on travis

Updated version patch

Fixes AMD registration, volo package.json entry