updated routes to rm deprecation warning when running rake test

Got dep warning running rake test...
```
DEPRECATION WARNING: defining a route where `to` is a symbol is deprecated.  Please change "to: :dashboard" to "action: :dashboard". (called from block (3 levels) in <top (required)> at /Users/afxjzs/.rvm/gems/ruby-2.1.2/bundler/gems/rails_admin-24d64363e0f0/config/routes.rb:3)
DEPRECATION WARNING: defining a route where `to` is a symbol is deprecated.  Please change "to: :index" to "action: :index". (called from block (4 levels) in <top (required)> at /Users/afxjzs/.rvm/gems/ruby-2.1.2/bundler/gems/rails_admin-24d64363e0f0/config/routes.rb:5)
```
etc. 
So I followed the directions stated. warning went away. i was having issues running the test suite so not sure if tests are passing.