Use gevent.sleep instead of time.sleep

Use gevent.sleep instead of time.sleep to prevent blocking (just to educate the users not to use sleep):

http://stackoverflow.com/questions/12040880/how-to-avoid-blocking-code-in-python-with-gevent
Correct docs: static_file returns a 403 on permission errors, not a 401
Merge pull request #576 from SpecLad/401-to-403

Correct docs: static_file returns a 403 on permission errors, not a 401
Handle whitespace control over templates using Windows end of line marker
Merge pull request #579 from muflone/master

Handle whitespace control over templates using Windows end of line marker
fix 575: typing error in html_quote util funcion
Added wheel support
Added test for unicode URLs
fix #581: Mounted applications are shadowed by other routes.

This is a workaround, not really a fix. I'm working on a better solution.
fix 582: Unnecessary lowercasing in FileUpload.filename
Added travis-ci meta file
Added dependencies for full travis-ci tests
Fixed travis build file
Travis again...
Disabling travis server tests for now. Needs more work
Travis does not support 2.5 and 3.1? Aww damn. Okay, last travis related commit for now. I am spamming the ICR channel with this.
Static analysis found some rough edges
Added travis tests for 2.5 and 3.1
Typo in travis setup script
Merge pull request #570 from FedericoCeratto/patch-3

Use gevent.sleep instead of time.sleep