mnh analytics
new getCommodityUsage function
add new function: getCommodityUsage
Changes to MNH Staff graphs
Merge branch 'develop' of https://github.com/cheriuyot/mnh into develop

# By cheriuyot
# Via cheriuyot
* 'develop' of https://github.com/cheriuyot/mnh:
  add new function: getCommodityUsage
  new getCommodityUsage function
  mnh analytics

Conflicts:
	application/controllers/c_analytics.php