add uuid, add include path for benchmark.h
add empty new line for BUILD
fix comments of chen3feng
add empty line at file end
add empty line at file end
cpplint all
delete chinese comments or change to english, comment out a test case for http_client
Merge pull request #101 from yeshunping/uuid

add uuid, add include path for benchmark.h
Merge pull request #99 from yeshunping/master

add sha1 , add some comments for MD5
Merge from master