first commit
setting up rspec, spring and guard.
created stations.
created routes model.
added index to lines forreing key, fix datatype on zone_column.
annotaded models.
created lines model.
rake task to load metro data.
rename table routes to metro_routes so we avoid conflicts with rails routes.
removed unecessary model.
finished rake task to load metro info.
clean up renamed files.
Merge branch 'master' of https://github.com/amalrik/codechallenge