Refactor: tsung recipe

 * rename setup to default
 * default split in dependencies and configure recipes
 * add package version/revision to attributes file
Refactor: more refactorings

 * more attributes
 * depend on nginx-app for nginx install and base setup
 * added chefspec to confirm status quo
 * made nginx.conf configurable
 * added/updated README
Fix: trailing  whitespace
Update: lucid vs. precise
Enhancement: remove support for 10.04
Update: a little testing
Merge pull request #429 from till/t/tsung

T/tsung