Merge pull request #78 from MengZhang/develop

Pull request from Meng's develop branch
Merge pull request #79 from MengZhang/develop

Develop pull request from Meng
Merge pull request #80 from MengZhang/develop

Develop pull request from Meng
Merge pull request #81 from MengZhang/develop

Revise the java doc
[maven-release-plugin] prepare release translator-dssat-1.2.6
[maven-release-plugin] prepare for next development iteration
Merge branch 'release-1.2.6' into develop