task: clean repo root

This change seeks to continue tidying up the repo.

* The database_configuration.json file is not used and has not been used since
  the project was published on github.  We remove the ability to look at files
  inside the source tree for database credentials.

*  Move example-profiles.md to the relevant documentation for plugins area and
   update the link to match.

README.md

@@ -670,7 +670,7 @@ For remote overrides, the following extended settings must be configured:
   * `target_high` - Upper target for correction boluses.
   * `target_low` - Lower target for correction boluses.
 
-  Some example profiles are [here](example-profiles.md).
+  Some example profiles are [here](docs/plugins/example-profiles.md).
 
 ## Setting environment variables
 Easy to emulate on the commandline:

database_configuration.json

@@ -1,4 +0,0 @@
-{
-    "url": null,
-    "collection": null
-}

lib/server/env.js

@@ -130,10 +130,7 @@ function setStorage () {
   env.food_collection = readENV('MONGO_FOOD_COLLECTION', 'food');
   env.activity_collection = readENV('MONGO_ACTIVITY_COLLECTION', 'activity');
 
-  // TODO: clean up a bit
-  // Some people prefer to use a json configuration file instead.
-  // This allows a provided json config to override environment variables
-  var DB = require('../../database_configuration.json')
+  var DB = { url: null, collection: null }
     , DB_URL = DB.url ? DB.url : env.storageURI
     , DB_COLLECTION = DB.collection ? DB.collection : env.entries_collection;
   env.storageURI = DB_URL;