[maven-release-plugin] prepare for next development iteration
Add new class implements calculation from the Saxton paper, 2006
Update interface structure
Add new function for PT calculation and implement the function call for PTSaxton2006
Add test case for no sand but slit available from soil data for PTSaxton2006 calculation
Add utility function for handling percentage value
Merge pull request #32 from MengZhang/develop

Develop pull request from Meng
[maven-release-plugin] prepare release agmip-common-functions-1.3.6
Merge branch 'release-1.3.6' (early part)