added installation-step "enable handlers"

- added missing installation step to docs
- see http://www.codeconsortium.com/en/forum/topic/57
Merge pull request #4 from jhkchan/master

Support error messages of login form from FOSUserBundle
Merge pull request #2 from christianbaer/master

added "enable login-/logout-handlers" to installation-doc
correct table of contents
Merge pull request #5 from jhkchan/master

Support AJAX login and logout
use lowercase tablename

uppercase tablenames make problems in win/linux-world
Merge pull request #6 from christianbaer/patch-1

use lowercase tablename
adjust composer.json for symfony >=2.1
adjust readme for symfony and doctrine dependency
Merge pull request #8 from jrobeson/patch-2

adjust readme for symfony and doctrine dependency
Merge pull request #7 from jrobeson/patch-1

adjust composer.json for symfony >=2.1
change php version requirement in README.md
Merge pull request #10 from jrobeson/patch-3

change php version requirement in README.md
remove backup file
Merge pull request #11 from jrobeson/remove-backup-file

remove backup file
inject relevant services instead of service container
add gateways and managers
clean up docblocks
improve php docblocks
add missing class docblocks