Fix: Install Gravatar-php
Mod: Install php-markdown by its package
Mod: Installation method explanation improvments
Del: remove vendor/ traces
Mod: Update composer installation (fix #78)
Add composer.phar into versionning to keep last used version
Update Gravatar Silex extension repository
Fix: Install Gravatar-php
Mod: Install php-markdown by its package
Mod: Installation method explanation improvments
Mod: Use Symfony 2.1 dependancies to avoid some code updates
Mod: Use new php-composer class
Merge branch 'issues/78' of github.com:mikaelrandy/aperophp into issues/78

Conflicts:
	composer.json
	composer.lock
Fix: use sf2.1