update loadStrategies() to be called on bootstrap

- deleted ref to `loadStrategies()` from callbacks
- removed need for `req` to derive `baseurl`. Instead use `sails.getBaseurl();`

This allows `loadStrategies()` to be called on bootstrap
update docs to reflect need to update config/bootstrap.js
small fix
Merge pull request #37 from gebrits/patch-3

update loadStrategies() to be called on bootstrap