Preliminary decay function entry
Updating an erroneous "=" sign
fixing Math::E
Commented out my work because it borked stuff
renaming function to be more relevant
Added date operations to current_alpha function
Had date section in wrong order /fixed
Completed current_alpha function
Added the alpha function
Removed the alpha function (placed in inventory) and added the hsi attribute
added validation for hsi attribute
took out the comments on the alpha decay function
re-worked the decay function
Added Column C which contains HSI for the given hop
Add HSI to hops model
Add harvest date to hop contract
Add storage temp/factor and harvest date to inv.
Actually add migration for harvest date
Add views for hop change
Add HSI field in db seeds