Add alternate name model.
Fetch alternate names for a crop.
Show alternate names on crop page
Added some additional hierarchy around cherry tomatoes
Merge pull request #430 from Skud/tomatoes

Added some additional hierarchy around cherry tomatoes
Add "Edit" link for alternate names on crops page.
Delete alternate name button on crops page.
Crop wranglers can add alternate names
Views for adding/editing alternate names.
Show alternate names on their own page.
Make editing alternate names actually do something.
Fix link to crop on alternate name page
Upgrading to ruby 2.1.2
Creation and deletion of alternate names
Fix model tests for alternate names.
Delete redundant old-style test.
Put alternate names controller in standard order.
Use login_as helper method in altname feature tests.
Make edit-altname test more featurey.
Fix and test altname index page.