Removed unneeded import

Ignore-this: a93e38b98e8798456afa8f54527c0a24

darcs-hash:20140318145938-56b4d-125c75c528a6d7374aa8d0ac9044235e5beff8f1
Avoid resetting greenlet when session is about to end or cancel a proposal

Ignore-this: 791d191819ff316c77920cd0df014caf

darcs-hash:20140324131600-56b4d-121fde76ca5e2b1ec31efcf265b7ed5ea4190cdb
Fixed cancelling hold requests

Ignore-this: 619ed8e845a5f243e6d54bb2f3c16297

darcs-hash:20140324140045-56b4d-26ab077deab79d54c40dc08f78d0295e0787bdc0