changes event.py:
  - self._result and self._exc should not be class's static attributes
  - self._exc  should not store exception trace, instead if exception occurred True
  - self._exc  do not need to store exception trace, the same exception is called with the schedule_call_global for self._waiters timers
  - no need to throw self._exc on wait, it is thrown on the switch

  changes greenthread.py: (adjustments)
   - use of super for init inherited class
   - main method, try send, except send_exception and raise, and finally _resolve_links

Signed-off-by: Kashirin Alex <kashirin.alex@gmail.com>

added test_no_mem_leaks to event_test.py
added tox.ini dependencies objgraph==3.4.0

Signed-off-by: Kashirin Alex <kashirin.alex@gmail.com>

changes greenthread.py: (adjustments)
   - use of super for init inherited class

Signed-off-by: Kashirin Alex <kashirin.alex@gmail.com>

changes event.py:

self._result and self._exc should not be class's static attributes (the Values were passing between the different Event instances)
self._exc is set back to None on last waiter has it's results (references kept them self, causing GC not to collect, Event has _exc and _exc has trace frames object in touched)

Signed-off-by: Kashirin Alex <kashirin.alex@gmail.com>

 - added test_no_mem_leaks to event_test.py
 - added tox.ini dependencies objgraph==3.4.0

Signed-off-by: Kashirin Alex <kashirin.alex@gmail.com>

 changes greenthread.py: (adjustments)
   - use of super for init inherited class
   - main method, _resolve_links finally

Signed-off-by: Kashirin Alex <kashirin.alex@gmail.com>

changes event.py:
  - self._result and self._exc should not be class's static attributes

Signed-off-by: Kashirin Alex <kashirin.alex@gmail.com>

…into 408-event-memleak

Signed-off-by: Kashirin Alex <kashirin.alex@gmail.com>

# Conflicts:
#	eventlet/event.py
#	eventlet/greenthread.py
#	tests/event_test.py

changes event.py:
 - self._exc should not store exception trace, instead if exception occurred self._exc=True (references kept them self, causing GC not to collect, Event has _exc and _exc has trace frames object in touched)
 - self._exc do not need to store exception trace, the same exception is called with the schedule_call_global for self._waiters timers
 - a wait on a triggered event is returning _results (without throw) None is exception/timeout

Signed-off-by: Kashirin Alex <kashirin.alex@gmail.com>

changes event.py:
 - self._exc should not store exception trace, instead if exception occurred self._exc=True (references kept them self, causing GC not to collect, Event has _exc and _exc has trace frames object in touched)
 - self._exc do not need to store exception trace, the same exception is called with the schedule_call_global for self._waiters timers
 - a wait on a triggered event with sellf._exc will throw current (GreenletExit)

Signed-off-by: Kashirin Alex <kashirin.alex@gmail.com>

changes event.py:
 - self._exc should not store exception trace, instead if exception occurred self._exc=True (references kept them self, causing GC not to collect, Event has _exc and _exc has trace frames object in touched)

Signed-off-by: Kashirin Alex <kashirin.alex@gmail.com>

Signed-off-by: Kashirin Alex <kashirin.alex@gmail.com>

…r test use

Signed-off-by: Kashirin Alex <kashirin.alex@gmail.com>

…r test use

Signed-off-by: Kashirin Alex <kashirin.alex@gmail.com>

…r test use

Signed-off-by: Kashirin Alex <kashirin.alex@gmail.com>

…r test use

Signed-off-by: Kashirin Alex <kashirin.alex@gmail.com>

Signed-off-by: Kashirin Alex <kashirin.alex@gmail.com>

Signed-off-by: Kashirin Alex <kashirin.alex@gmail.com>