Merge pull request #27 from zelgerj/master

refactoring due to server component split off
Update composer.json
Refactor Session + StandardSessionManager as Stackables
Merge pull request #28 from wagnert/master

Refactor Session + StandardSessionManager as Stackables
Remove storage injection for session manager
Merge branch 'techdivision'
Merge pull request #29 from wagnert/master

Remove storage injection for session manager
Refactor session handling
Merge branch 'techdivision'
Merge pull request #30 from wagnert/master

Refactor session handling
Add possibility to specify session configuration in web.xml file
Merge branch 'techdivision'
Merge pull request #31 from wagnert/master

Add possibility to specify session configuration in web.xml file
Refactoring session handling
Refactoring to inject dependencies
Merge branch 'techdivision'
Cleanup code
Merge pull request #32 from wagnert/master

Refactoring session handling
Bugfix invalid lowercase namespace declaration
Merge pull request #33 from wagnert/master

Bugfix invalid lowercase namespace declaration