fix error log
avoid issue #154
fix issue #156
improve seri lib
add message log
clear socket when connect failed
update history for release v0.6.1
Merge pull request #160 from cloudwu/dev

release v0.6.1
Merge branch 'master' into dev
better error message
better error message
only skynet.call response error
Merge branch 'master' into dev
add sha and hmac-sha1
add example injectlaunch to show how to inject code
add testresponse
Merge branch 'master' into dev
Ignore DS_Store file for Mac OS X users
Merge pull request #165 from chuenlungwang/master

Ignore DS_Store file for Mac OS X users
remove duplicated line to fix issue #166