added functions for summarizing a single parameterized distribution or a table of parameterized distributions:  and
Added functions, tests, and documentation for distn.stats function used to calculate mean, sd for named and parameterized distribution
Added functions, tests, and documentation for distn.stats function used to calculate mean, sd for named and parameterized distribution
Merge branch 'master' of https://github.com/dlebauer/pecan
revised, integrated, edited functions in DB module. Removed 'working' folder from module that contained duplicate / deprecated functions; updated PEcAn.DB module documentation;
Merge pull request #5 from dlebauer/master

revisions to DB module