Improve dp event handling
minor changes to environment.py to work with Sauce/Jenkins
Merge pull request #87 from OrlandoSoto/master

minor changes to environment.py to work with Sauce/Jenkins
Merge pull request #88 from ascott1/dev

Prevent non-numeric character inputs
Merge branch 'master' of github.com:cfpb/owning-a-home
Merge pull request #89 from contolini/master

Improve down payment event handling
zero out down payments if user enters 0 for house price
add comment for checkIfZero
use the house price passed to the API
reset defaults after user enters a 0 house price