feat: Resolves Lesson 3: TODO 3 and 4
feat: Resolves Lesson 3: TODO 3 and 4

Retrieves profile from Datastore and if save_request, store modified profile to Datastore.

Resolves #5

iraquitan/udacity-fsnd-p4-conference-app,iraquitan/udacity-fsnd-p4-conference-app,iraquitan/udacity-fsnd-p4-conference-app