Added optional extra_headers parameter#173

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wjdecorte wants to merge 2 commits intodruid-io:masterfrom wjdecorte:f_add_extra_headers

+181-68

Commits on Aug 13, 2019

Added extra_headers parameter; Added compressed data support
wjdecorte
committed
Added spaces to line 105 and 106 in test_client to pass unit testing
wjdecorte
committed