Psycholinguistics Dashboard iteration 4 - Display Stimuli 

This week:
* more widgets to display all data in a database
* can view stimulus (fields, images, audio)

This pull request depends on:
* https://github.com/OpenSourceFieldlinguistics/FieldDB/pull/1596

TODOs:
* html5 router is failing when deployed to apache (investigate htacces)
* deploy map reduces to all dbs to support speakers/participants etc
* use different templates for user vs participant, or create new directives? investigation of inheritance between directives