Added ShoppStyles dependency manager and styles service script
Merge branch 'master' into styles-server
Merge branch 'master' into styles-server
Fix for 1.3.x branch

See #3088
fix #3030

To make a valid link show up on orders when multiple parameters are set (trackingnumber and postcode).
Fixed purchase_item_input filter implmentation.
Merge branch 'msigley-patch-purchaseitem_input' into 1.3.x
Merge branch 'msigley-patch-purchaseitem_input'
Added shopp_product_load_meta action hook

Allow third-parties to load their own meta data after product meta is loaded
Fixed garbage collection to remove empty sessions regularly
Merge branch 'feature/session-rewrites'
Merge branch 'msigley/meta-load-hook' into 1.3.x
Merge branch 'msigley/meta-load-hook'
Merge branch 'JM-fix-#3030' of https://github.com/Just-m/shopp into Just-m-JM-fix-#3030
Merge branch 'Just-m-JM-fix-#3030' into 1.3.x
Merge branch 'Just-m-JM-fix-#3030'
Merge branch 'Variations-API-fix-again' of https://github.com/crunnells/shopp into crunnells/pr/3090
Fixed versioning
Synced product.addons and product.variants loops
Merge branch 'crunnells/pr/3090'