Merge pull request #1 from wso2-dev/master

Pull request from wso2-dev/wso2-axis2 repo.
Merge pull request #2 from malakasilva/master

HTTP Patch support added
Merge pull request #3 from wso2-dev/master

Adding by Malaka ESBJAVA-3061
making org.apache.catalina.tribes package an optional package of axis2 since wso2 no longer ship tribes.