Fallback since older versions of Tornado can't handle max_hader_size
Adding ordereddict dependency to debian/control
Merge pull request #417 from freider/ordereddict

Adding ordereddict dependency to debian/control
Merge pull request #413 from spotify/erikbern/max-header-size-fallback

Fallback since older versions of Tornado can't handle max_hader_size
Switch to using POST for RPC requests.
Fallback to GET if scheduler doesn't support POST.
Remove GET request size workaround.
set permissions of pidfiles to 777

This commit also features some super minor refactoring of luigi.lock
Merge pull request #411 from campanja/http-post-in-rpc

Switch to using POST for RPC requests.
Remove deprecated code from hive.py
Merge pull request #421 from spotify/erikbern/pidfile-777

set permissions of pidfiles to 777
Merge pull request #422 from spotify/arash/remove-deprecated-stuff

Remove deprecated code from hive.py