Do not explicitly force non-standard timeouts

This should specifically not set timeouts that have been changed.

I also ran the code through autopep8 for good measure.
Merge pull request #64 from vjanelle/fix_elb_timeouts_forcing

Do not explicitly force non-standard timeouts
Fixes error when idle_timeout not defined in elb config
Merge pull request #65 from yo61/master

Fixes error when idle_timeout not defined in elb config.
thx robin