--HG--
rename : greentest/test__core_active_event.py => greentest/test__core_callback.py

also remove unused TestCase0

- core module gets a completely new interface, incompatible with gevent-0.13
- SystemExit, KeyboardInterrupt and SystemExit are now re-raised in the main greenlet
- Python's signal module works

__init__.py:
  - add get_hub to __all__
  - remove shutdown()

get_hub() now accepts arguments to pass the loop (e.g. get_hub('select'))

Hub class:

  - new methods: handle_error, wait, cancel_wait, join
  - removed method: shutdown (replaced by join())

Timeout class:

  - allow passing string as exception

coros, event, greenlet:

  - use hub's handle_error to report_error rather than traceback module
  - save hub as an attribute rather than calling get_hub() all the time

--HG--
rename : gevent/core.pyx => gevent/core_.pyx

replace get_hub().switch() with self.parent.switch - should be faster as it avoids accessing threadlocal

--HG--
extra : transplant_source : %1A%E6q%AD%D1mm%DE%D8%8E%A8i-%E2%5EB%BAsG%FB

--HG--
extra : transplant_source : %15%CD%D6%04%138.%C8%C2%1A%9Ag%B0%2C%3B%C6%C4%E4%A3%E3