Refactor to simplify
Updates to K12 and CorTransform functions. Changed K12 input formatting requirements and messages, specifically the 'sigma' input requirements (to covariance only); changed K12 SI index functions to handle NaNs. Changed calculation method for 'delta' in CorTransform, to account for simulation cases (when no data input to function).
Updated K12 and CorTransform function. K12 updates: changed input formatting requirements/warnings, requiring for simulations that sigma be a covariance (not correlation) matrix; changed so SI function handles NAs. CorTransform: delta was computing incorrectly in some cases with simulated data, fixed. Added package documentation.
"Merge remote-tracking branch 'origin/master'"

Conflicts:
	README.md
"trying to fix/merge local and remote README.txt file" Merge branch 'master' of https://github.com/mclevy/CorSens

Conflicts:
	README.md