Updated orders pagination
Fixed creation of modifiers/variations
Updated slugs to include variation details
Added helper function to assign correct variables

Because of how we pull items out with streams the first, last and
odd_even variables are incorrect. Results are now processed through
filters to ensure they are assigned correctly.
Items added via admin to orders use creator id
Updated duplicate product code for modifiers
Merge branch '1.2/develop' into 1.3/develop