Support headers in requests#10

Open

maads wants to merge 3 commits intoerizet:masterfrom

maads:add-headers-to-request

Commits on Apr 18, 2017

Added support for request headers
maads
committed

Commits on May 4, 2017

Added test for connection with header and cleaned up the implementation.
maads
committed
Reverted accessibility level on EventSource constructor. Was changed by mistake.
maads
committed