tweak the glibc sha1() function
redesign and implement the sharding API.
add redis-c library into source code.
solved the hiredis library issue.
revise the ccache data API.
revise ccache API.
resolve the hiredis compilation issue
initial merge of network
ccache module
Merge pull request #2 from lwan86/master

ccache module initial
add data set
cleanup the data input
cleanup ccache.cc code style.
merge with network module.
cleaned the codes of network.h and network.cc