Add a basic test that reads a large chunked response.
Add a basic test that reads a large chunked response.

* test/test_context.c
  (test_serf_connection_large_response): New test.
  (test_context): Run the new test.

muthusuba/serf,liuzongquan/serf,krime/serf,justinweb/serf,blueszhangsh/serf,sworda/serf,sworda/serf,justinweb/serf,blueszhangsh/serf,krime/serf,Manouchehri/serf,krime/serf,krime/serf,Manouchehri/serf,wzugang/serf,sworda/serf,blueszhangsh/serf,muthusuba/serf,TommyU/serf,muthusuba/serf,idomon/serf,muthusuba/serf,idomon/serf,idomon/serf,wzugang/serf,Manouchehri/serf,justinweb/serf,TommyU/serf,TommyU/serf,wzugang/serf,liuzongquan/serf,justinweb/serf,liuzongquan/serf,idomon/serf,TommyU/serf,liuzongquan/serf,wzugang/serf,Manouchehri/serf,blueszhangsh/serf,sworda/serf