fix gemspec warnings
update the version
try to fix travis
Merge pull request #123 from guangyang/release-0.6.1

Release 0.6.1
update changelog
run travis again
try to fix travis
loose mocha dependency version
Merge pull request #126 from guangyang/release-0.6.1

Release 0.6.1
Merge pull request #127 from WindowsAzure/master

master to dev for release 0.6.1