Limit resource routes with :only/:except option
Fix routing of root path and allow definitions of routing paths with leading slash.

This resolves https://github.com/phoenixframework/phoenix/issues/21
Remove excess funtions around action extraction
Merge branch 'merge_nested_and_limited_routes' of github.com:nurugger07/phoenix into nurugger07-merge_nested_and_limited_routes
Move resources generation and add :edit, :only, and :except tests.