Imprintables Controller: Refactor usage of create to alert user of failure
Lanceng Works in print view for quotes
Quotes uses new+save to warn user of errors in li creation
Quote show: quote details no longer displays shipping
Line Items controller errors on failure of save

Clean up error flashing for imprintables controller
imprintable.create_imprintable_variants returns false if save fails
Removed usage of instance variables in imprintable partials