Fix groups vs. anonymous functions

This commit assumes parentheses as expression group
until it being followed by an arrow.

Fix l-value variable scope in assignments

Fixes #254

Fix number patterns

Fixes #253

Syncs number patterns with ST's core JavaScript syntax.

README: Remove maintainer request

Add `await` keyword

Base CoffeeScript Literate on bundled Markdown

Fix indentation rules

Fixes #247

fixed #14 with help of @idpsycho#

Updated readme and changed default value for compileDir setting.