Merge pull request #2 from cameronbracken/master

Add roxygen skeleton, package checks without error (but a few warnings)
Update DESCRIPTION
Updated README.md
Fixed markdown.
Updated roxygen comments, changed variable names

for consistency and clarity.
Updated documentation, added water year functions
Fix issue introduced in trying to key by datetime.
Update known issues.
Merge branch 'master' of https://github.com/eheisman/DSS-Rip

Conflicts:
	R/dssrt.r