* upgrade node to version 6
* upgrade npm to v4
* update shrinkwrap
* use npm 4 in travis
* use mongoose 4.6.4
* update shrinkwrap
* fix async test and upgrade mongoose
* fix amazon test
* remove debugging code
* working tests with separate server
* update coupon code
* mupdate mongoose
* nvm: relax node version in .nvmrc
- added docker-compose.yml for quick one-command spinup
- added docker-compose.dev.yml to override /habitrpg mount
- modified Dockerfile to accept /habitrpg mount
- removing broken sed (was also updating BASE_URL) in favor of NODE_DB_URI (will require documentation)
- changing build order to reduce rebuilding some things unnecessarily
- more effectively using WORKDIR to simplify commands