Merge pull request #19 from Cfeusier/Gary

refactored seed file, added relationship between Artist and Lyric
Abstract seed file
Change key for seeder
Final MVP for Demo
Updated functionality to take keywords and output excerpts:
- when running the program, the first input should be 'keyword'
- next input should be a keyword
- keep going in this fashion - type 'keyword', hit enter, then input a keyword
- DEFINITELY need to clean up the view for this - the methods I put in the view probably need to go in the lyric model