Update readme + composer requirements; move license file and drop bui…

[usox]

I updated the readme and the composer.json according to #41. Also, I removed the build.xml and the phing targets from the Makefile due to dependency problems to PEAR-Packages (FileManager at least). The only used phing target was tar which (from what I understand) is/was used to build a release package. Any thoughts about that?

[Ocramius]

should be LICENSE

[Potherca]

The link to Pornel's travis is broken.. I've set up a new one: https://travis-ci.org/phptal/PHPTAL
New code is:
[![Build Status](https://travis-ci.org/phptal/PHPTAL.svg?branch=master)](https://travis-ci.org/phptal/PHPTAL)

[Potherca]

First of all: thank you for the work thus far @usox !

Other than a few minor pointers this looks good to me. I feel inclined to merge this.

@Ocramius / @pornel ?

(Also, do we want this to go on master or a v2 branch and integrate later? I think we need to start making that CONTRIBUTING file...)

[Ocramius]

@usox @Potherca merged and created branch 1.3.x off of tag 1.3.0.

master is 2.x if you want (we can alias it in a different PR if you prefer so)

[Ocramius]

Also applied the review comments