Support Symfony 2.3
Fix the order of installation options
Fix spelling
Remove the unneeded type attribute
Change Composer version format
Remove extra spaces
Remove unneeded quotes around JS objects properties names
Composer *since* Symfony 2.1
Merge pull request #79 from elnur/symfony-2.3

Support Symfony 2.3
Merge pull request #80 from elnur/doc

Various doc fixes