Bug fixes and supporting search items by epid

Searching items by EPid - #140
Group filter params - #147
Allow options to getSingleItem -#148

Feature: Added buyerPostalCode and support multiple filters

CC: @EarthlingDavey

• #138
• #137

Deprecate deals api

• Added deprecation message for getDeals.
• Added example using express js

Support ebay deals api

• Get the daily deals in ebay for all sites.
• Get the deals based on particular category.

Remove oauth-ebay module

• Remove Oauth-ebay module from dependency for security reason.

Enable filter for findItemsByCategoryId and bug fixes

#106
#104

Bug fixes and cleanup tasks

Fixes #96

Added findItemsIneBayStores API support

• users can find the items based on the seller.
• find items in particular seller store

Support includeSelector in getUserdetails api

• support include selector in getUserdetails API.

Added GetSingleItems and GetMultipleItems shopping API.

Shopping Api : Added getSingleItems and getMultipleitems  (#84)

* v2.7.7

* add getSingleItem for shipping api

* added getMultipleitems shopping api support

* version bump and update read me

* update version