using word id, simplified ui routes

ui: simplified routes, removed .index routes
ui: added ui-view to route bases
ui: moved network graph link to actions bar
ui: added alert directive to display alerts
ui: added alert to topic renaming
backend: removed word attribute from word model, using id instead
backend: moved topics query from single word query to subpath /topics
backend: removed uuid from apierror, unused
backend: removed wrapper from resource put requests, serializing to model directly
backend: fixed deserializing topicword/word when receiving from frontend