Update access token for travis.
Merge pull request #15 from m1ch1/doc

Update access token for travis.
Add a link to the javadoc page.
Simple implementation of Zxid
Define the interface of Log
Simple implementation of log interface.
Merge pull request #2 from EasonLiao/master

Implement a simple transaction log
Add logging dependencis in pom.xml
Merge pull request #18 from EasonLiao/addlogging

Add logging dependencis in pom.xml
Define the Zab client interface.
Merge pull request #11 from EasonLiao/master

Define the client facing interface to ZAB