[maven-release-plugin] prepare for next development iteration
Add new function for calculating irrigation date and create event based on the calculate result.
Change the GDD calculation that if the GDD value for a day < 0, then consider it as 0.
Merge pull request #27 from MengZhang/develop

Develop pull request from Meng
Merge pull request #28 from MengZhang/develop

Develop pull request from Meng
[maven-release-plugin] prepare release agmip-common-functions-1.3.3
Merge branch 'master' of github.com:agmip/agmip-common-functions.git