travis: explicitly reinstall python from deadsnakes
Update known_failures.py

- mark test__os.py as flaky on python-dbg
- remove test_queue.py and test__threading_vs_settrace.py from FAILING
fix an encoding issue in gevent.core for PY3 #38
made gevent.core buildable under 32 bit systems
Merge pull request #447 from segfault87/master

made gevent.corecffi buildable under 32 bit systems
- bugfix for error: ISO C90 forbids mixed declarations and code in libev header
Merge pull request #449 from jakecast/master

- bugfix for error: ISO C90 forbids mixed declarations and code in libev...
Fix broken link in the Introduction doc
Merge pull request #454 from yprez/patch-1

Fix broken link in the Introduction doc
Fix peek() in LifoQueue.

peek() should return the same element that get() returns, which
is not currently the case.

Add regression test for queue peek().
update changelog
Remove extra backtick

Markdown typo correction
Merge pull request #470 from atarzwell/patch-1

Remove extra backtick
Fix absolute import issue in core.ppyx in PY3, refs #38