Tempfiles created by a large request should be closed and deleted.
When a request with a large body was closed it would unlink the Tempfile created but it would not close it leaving opened file descriptors. Calling close on the tempfile ensures that the file descriptor is released.
Merge pull request #225 from Tonkpils/leo/close-request-tempfile

Tempfiles created by a large request should be closed and deleted.
#226 add HTTP 422 status
Merge pull request #227 from rajcybage/422_status_added

#226 add HTTP 422 status
Add changelog entry for last commit
Add warning about running EM loop when stopping.