model associations 1st draft
Merge pull request #3 from arieldiamond/associations

model associations 1st draft
Merge pull request #4 from arieldiamond/master

Merge pull request #3 from arieldiamond/associations
Merge pull request #5 from arieldiamond/associations

Merge pull request #4 from arieldiamond/master
notes
adds more trip participations to seed_file
Merge branch 'master' into seed_file