Merge pull request #2 from jccomputing/master

Ignore interval_length attribute
Chery-pick from comment-and-downtime : Add comments into database and merge conflicts
Cherry-pick from comment-and-downtime : Add Downtimes in Database + Fix comments
Fix Syntax
Add : Cache for downtime and comments
Add : scheduled_downtime_depth into host and service status tables
Add : action_url in hosts and services tables
Add: Travis build
Add: Travis build
module name uniformisation
Merge pull request #4 from matthieucan/patch-1

Enh: module name uniformisation