add json serializer perf test2
move system files to supporting files folder
add debug flag & change content-type
json parser read key case insensitive
fix time unit diff between server and client
minor fixes
rename client test
add error test, check network before post
add multi thread perf test
fix bug of redundant objects added to dictionary
test multithread to async test case
remove network error check after discussion
customize param, read from NSData
update project setting
temp - memory management