Add request headers and fix xsi object type#31

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skplunkerin wants to merge 4 commits intocongaengr:masterfrom

skplunkerin:add_request_headers_and_fix_xsi_object_type

Commits on May 24, 2018

- Update README.md with forked repo specifics
skplunkerin
committed

Commits on May 25, 2018

- Add header parameter to Client update methods to test AllOrNoneHeader
skplunkerin
committed

Commits on May 28, 2018

- Revert README.md to initial values (removing my custom repo notes)
skplunkerin
committed
- Remove headers from method params, place into attr_accessor to allow setting header for any request
skplunkerin
committed