Finished algorithms for the Ers data and added tests.
Readded the Total Population field to Census
Merge branch 'master' of github.com:CivicNinjas/HealthAround.me

Conflicts:
	data/ers/loading.py
	healthdata/algorithms.py
	healthdata/tests/test_algorithms.py
Merge pull request #30 from harbieism/master

Added Population Field back in to Census Data