Added xmlsec1, M2Crypto and lxml packages, fixed deploy bug.

- Added xmlsec1 compilation, also M2Crypto and lxml packages installiation from
precompiled eggs. Fixes #6.
- Removed double environment.sh call on application deploy
Merge pull request #7 from WiserTogether/cart_update

Add lxml, m2crypto, xmlsec1 dependencies to patton cartridge