added low and high salary permits

Merge remote-tracking branch 'origin/master'

Merge branch 'feature/allow_separate_dev_credential_loading'

modified readme to reflect dev environment setup

set constants in settings.rb for dev environment

Merge pull request #3 from bonnerjp/feature/update_opportunity_and_defaults

Merge branch 'feature/update_opportunity_and_defaults' of github.com:bonnerjp/opportunitydatabase into feature/update_opportunity_and_defaults

added migration to have default salary and did inclusion check against track

added migration to have default salary and did inclusion check against track

use destructive map to make sure salary retains order of magnitude adjustment

updated salary fields to be more descriptive

change modulus to divide to fix salaries not being imported properly

adjusted edit function for new salarry formats

Merge pull request #2 from deanxorr/feature/fix-salaries

add salary_low and salary_high columns and refactor import task