Modified Journey index view

Transitioned Journey index view from table to divs
Renamed Journey.body to Journey.description

Also updated all references of Journey.body to Journey.description.
Began defining relationship between Entry/Journey

Began expanding rspec tests. Next steps are to finish expanding the
tests, then to define the relationship in the Entry/Journey models.
Relate Journeys to Entries

Nested Entry routes within Journey
  /journeys/1/entries/1
Updated paths in all views
Updated Journey index.html.erb to list journeys and their entries
Updated Journey show.html.erb to list the entries of that journey