HttpClient: Added an option to disable the Expect: 100-continue header
HttpClient: added a debug callback and used it to test the 100-continue in the http_client_test
Merge pull request #137 from datacratic/http_client_expect

Http client expect
added SMOVE command to redis
added a is member of set command and an exists command
added unit testing for SMOVE, EXISTS and SISMEMBER commands
Merge pull request #139 from datacratic/redisSMOVE

added SMOVE command to redis
Merge branch 'master' into http-client-ih

Conflicts:
	service/http_client.cc
	service/http_client.h