Merge pull request #5 from agfk/frontend_v2

fixed dependency pointer url
updated README install instructions
updated README.md instructions
restructured html file system
basic working search functionality between django and content server
created basic search-results page and navigation
improved search aestetics
renamed Node to Concept, moved to its own module
eliminated user data
decoupled graphs and concepts
added shortcuts
made Graph class agnostic of the database structure