`Model#save!` instead of `Model#save`
backfill test for Artist#get_data
move artist-finding into Artist model
WIP fixing artist model and factory

...and specs
WIP done with fixing artist
reword the headline
expect syntax
fix undefined method [] of nil when accessing @data in #albums

* Artist model assigns its attributes before_create now...
* which fixes first Artist factory test
* ...2nd/"idempotent" factory test disabled
* passing tests
cleanup
home page spec passing...

...by knowing too much about Artist
clean up those vcrs
Merge pull request #70 from alxndr/improvements

move artist-finding into `Artist`, etc