Use invoke_drop in map filter
Merge pull request #230 from Shopify/use_invoke_drop_in_map

Use invoke_drop in map filter
Add license to gemspec, closes #231
Always call 'to_liquid' on staff in map filter and allow to_liquid to be called on drops
Merge pull request #232 from Shopify/to_liquid_stuff

Always call 'to_liquid' on stuff in map filter and allow to_liquid to be...
Fix mapping over procs
Merge pull request #234 from Shopify/fix_mapping_procs

Fix mapping over procs
Update README.md
Make 'map' filter work on Enumerable drops
Merge pull request #233 from Shopify/make_map_work_on_enumerables

Make 'map' filter work on Enumerable drops
Use kind_of? instead of class.include? and rearrange stuff
Update History.md
Fix clashing method names in enumerable drops
Update some Drop tests
Ruby 1.8.x compatibility
Fix .include? method on Enumerable drops, used by "contains" conditions
Merge pull request #238 from Shopify/fix_clashing_method_names_in_enumerable_drops

Fix clashing method names in enumerable drops
Update History.md
Make sort filter work on Enumerable drops
Fix broken map test and add sort test