Module 3, network operation
Json module
Added Json handlers and hooks examples
Added ujson explanation of datetime handling
Merge pull request #19 from lerovitch/master

added mysql
Merge remote-tracking branch 'origin/master'
Added exceptions handling to logging module
Merge pull request #20 from pablito56/mod_json

Json module
Debugging module
Merge branch 'master' into mod_debugging
Merge pull request #21 from pablito56/mod_debugging

Debugging module
added gevent