Added plant_part attribute to harvest
Added plant_part validation to harvest model
Added 'other' and 'whole plant' to harvestable plant parts
Added plant part to harvest form
Added pollen as a harvestable plant part
Moved help text so it flows more nicely
rails g scaffold PlantPart...

Also migration to remove the string plant_part.
Load plant parts in db:seed and rake task.
Test that only admins can manage plant parts.
Add friendly URLs to plant parts.
Can't delete plant parts that are being used
plant parts have crops through harvests
remove annoying scaffold-generated tests
prettify plant part views
Add plant parts to harvest views
Show aggregate 'grown from' data on crop page
Added plant part to harvest CSV
Added harvests and plant parts to crops CSV
Quick links to crop pages in Markdown.
s/system_name/name