Initial client API
updating test_client.c
Added sample chunk callbacks for client
Updating test_client.c
Merge branch 'master' into feature/evhtp_client

Conflicts:
	CMakeLists.txt
	evhtp.c
	evhtp.h
	htparse/htparse.h
	test.c
Merge from master fixups
Add test_proxy: example code for using evhtp_client functionality to implement an HTTP reverse proxy.
Add evhtp_kvs_add_kvs / evhtp_headers_add_headers to copy headers from source to dest.
Update test_proxy: pause the frontend request while processing the backend request; pass headers through with evhtp_headers_add_headers; run backend requests on same thread evbase as the related frontend request.
Merge branch 'release/1.1.7' into develop
Enable search engine for Doxygen.
Merge branch 'master' into develop
Merge remote-tracking branch 'sodabrew/feature/evhtp_client' into feature/sodabrew_client

Conflicts:
	.gitignore
	evhtp.c
	evhtp.h
Fixed bug in body-based query checking.
Merge branch 'develop' into feature/sodabrew_client
use EVHTP_DISABLE_SSL instead of USE_SSL
Fix some generic warnings in test_proxy.c
Add documentation on fallthrough state for method proto.
(htparse): Properly propagate errors from hook_on_hdrs_begin_run()

Previously returning an error from evhtp_hook_on_headers_start() did
not terminate the connection.
(htparse): Use correct arguments to hook_path_run().