Switch suggested git URL to http:// instead of git://

A git url of git://github.com/Gregwar/CaptchaBundle.git didn't work for me.

http:// is more reliable, and is used by all the deps in the symfony standard edition  http://github.com/symfony/symfony-standard/blob/2.0/deps
Merge pull request #28 from rjmunro/patch-1

Switch suggested git URL to http:// instead of git://
Fix Bundle for symfony 2.1 beta4
Fixing call to undefined methode
Merge pull request #30 from piscis/patch-2

Fixing call to undefined methode
Merge pull request #29 from piscis/patch-1

Fix Bundle for symfony 2.1 beta4
Fixed Typo

typo
Merge pull request #32 from fabienpomerol/patch-1

Fixed Typo
[README] Changing composer (fixes #33)
[README] Fixing endspaceless (fixes #35)
Add URL generation method and update to Symfony 2.1 standards
[view] Adding empty "alt" to ass HTML5 validator (fixes #37)
CS
Add key parameter to URL generation method.
Optimize formatting for Symfony coding standards
Update documentation
Add "valid_keys" documentation
Separate generation concerns into different services
Remove caching of form name for key
Merge remote branch 'origin/urlgeneration' into logicsplit