Fixed .travis.yml
Merge pull request #48 from masanori-yoshimoto/travis

Travis
Fixed compile warnings
Fix pthread_cond_wait() in zookeeper_lock::_assure_session_connected()
Merge pull request #44 from yayugu/fix/compile_warnings_

Fixed compile warnings
Added coverity scan for develop branch
Merge pull request #53 from ikehara/zklock_condvar_fix

Fix pthread_cond_wait() in zookeeper_lock::_assure_session_connected()
Avoid to close the already closed socket.
Merge pull request #55 from masanori-yoshimoto/bug-fix/avoid-double-close-socket

Avoid to close the already closed socket.
Run tests with zookeeper on travis-ci