Fix caching functionality
When calling functions, do it with in-scope functions-in-variables.
Only add a $ if no $ already
Fix caching if multiple files have same name

I'm an idiot, I truly am.
ns-counter dirty fix
if isset
jade block fix
fix repeated block output
Merge branch 'master' of https://github.com/zerkalica/jade.php

Conflicts:
	src/Jade/Compiler.php
fix php funcion exec
fix inline exec.
Merge pull request #8 from ryunhe/master

fix repeated block output