Gcalcli

* Support for Python3 via six

* Move from gflags to argparse
This is a major, non-backwards compatible change (hence the roll up to v4)

* Support for adding attendees (jcmuller)
* Fix crash when organizer/attendee don't have emails (tschwinge)
* TSV export support `--no-started` (matthewdavis)
* Support for displaying attachment links (shi2wei3)
* Allow ignoring declined events (dmathieu)
* Warning if cache appears to be stale (nealmcb)
* search now supports start and end times like agenda (watersm)
* current event is proper colored in agenda (karlicoss)

* More ascii vs. unicode issues (*le sigh*)
* Use correct dateutil package (python-dateutil)

* TSV support for search
* `--detail email` to display event creator's address
* Pin oauth2client version to prevent issues with gflags
* Updated README with options to use custom client_id/client_secret

* Support for adding All Day events (238d527 / SBECK-github)
* Fix date display issues (e9a4a24 / njoyard)
* Attempt fix for per-account quota errors (6416c7d)