Update methods.md
missing table tag in shipping methods
Update products.md

bug fix. links
Fixed a typo

Changed 'coupon id' to 'shipping method id'
Added recent API changes

14 May to 27 May updates now included
Merge pull request #15 from troycox/patch-4

Added recent API changes
Added docs for include_sku filter in prodcts and currency fields in store.
changed customer_groups to customersgroups
Added API changes for 3 June release
Merge pull request #17 from troycox/patch-6

Added API changes for 3 June release
Merge pull request #14 from troycox/patch-3

Fixed a typo
Updates for 11 June release
Merge pull request #18 from troycox/patch-7

Updates for 11 June release
Merge pull request #16 from mechatama/products-inventory-filter

Added docs for include_sku filter in prodcts and currency fields in store resource.