first pass at Express 3-4 migration, all tests passing, gameplay working
change .send() to .status().send() and .sendStatus()
Merge pull request #316 from tongxiang/express3to4

Migrating Express 3 --> 4
add routes directory
modularize /sms-multiplayer-game route
add modularized donations router
add modularized routers for /pregnancy-text and /ds-routing
change modularization in routes/index.js
Merge pull request #318 from tongxiang/router

Modularize routes to use Express 4 .Router() function
Merge pull request #324 from DoSomething/dev

merge for deploy router refactoring for Express 4 migration