Merge pull request #35 from wagnert/master

Add copyBodyStream() method to Response object, remove getChecksum() method call in garbage collector
Merge pull request #36 from wagnert/master

Refactoring for usage with TechDivision_HttpMessage library
Bugfix for invalid session lifetime initialization
Merge branch 'techdivision'
Merge pull request #37 from wagnert/master

Bugfix for invalid session lifetime initialization
Add getHeader() method to response to implement HttpMessage ResponseInterface
Merge branch 'techdivision'
Merge branch 'master' into threaded-application