Add ability to set resource labels in config

[jasonmccuen]

• This commit adds the configuration options to the config file so the Resource Label can be changed.:

  • 'resource_label'
  • 'resource_singluar_label'

• This is done because the default static methods 'Resource::label()' and 'Resource::singular_label() were returning 'nova-page' and 'nova-pages'

• These labels look bad

• When white-labeling Nova for clients, Nova should not be displayed at all to the end-user

• This commit uses protective coding to ensure that if the configuration file is empty or the value is not otherwise set that the default values are used.

[voidgraphics]

Thanks for the help!