hello world web app
inroduce gorilla muxer
add a small json example

should look into mongo connection now
add DB connection, quick offers api mock
add DB models
add utility method for responding in JSON
remove unnecessary safety
use models for offers API
use pointers for model references
update models for DB design changes

the data was denormalized
update db connection to use environment conf

also update mgo import location
move db/connect -> db/client to enable setup for tesing

Configuration should also be solved in a better way than just ENV variables
Perhaps a configuration object that has defaults, gets secondary defaults
from the environment and can also be manually configured for tests
WIP for DB tests
omitempty
add config
add config for test
update tests to drop DB before and after suite
add restaurant and tag collection DB handlers
clean up db test suite setup