measure code is auto generated on creation

Add: new model for counters
Add: measure model has new methods to set code and get max code
Add: initializer that creates a counter if needed, and stores max code
Add: code field is read-only on new measure form
updated mongodb data from production, after Monday conf call.
Merge branch 'master' of github.com:kristenhazard/epm-catalog
removed 'all covered species' tag from import task.
removed split tag name on parenthesis regex from import task.
adding 2 new csv files, added back parse on parenthesis to import task.