Updates to aggregation admin, ability to edit home page text, aggregation viewers change, and more refactoring

Single Aggregation admin viewer
  - Finished refactoring and updating the first four tabs, and overall appearance
  - Removed curatorial list of admin variables ( Admin_AggregationViewer )
Aggregation html subwriter
  - Authenticated, priviledged users can edit the home page text directly
  - Modified the main display modes to have Aggregation as option, and then a sub-type of Aggregation_Type
Updated mySobek and Admin viewers to have access to writing in the form before the placeholder and after the placeholder
Merge branch 'master' of github.com:MarkVSullivan/SobekCM-Web-Application