beginning new migration process with new commands
Adding new commands to facilitate database migration reversal
modifying build models command to remove prefixes before generating model classes
Finishing working migration system add on for our process and adding amount column as a live test
Merging master into migration branch
adding phinx along with original migration
first changes to the migration commands to port to phinx
removing old migration commands and finishing build models
removing old dumps directory
Adding rollback command to go back to last stable version backup
Replace propel migrations with phinx

Summary: Replace propel migrations with phinx

Test Plan: N/A

Reviewers: allauthors, latent-codex-awalker

Maniphest Tasks: T2

Differential Revision: http://phabricator.latentcodex.com/D3
adding version of phinx yml to the repo
Merge branch 'T2_new_migration_process' of https://github.com/latentcodex/estimator into T2_new_migration_process