adding cv_logic to repo

This contains all of the logic for the cv project.
Currently finished functions:
createHedgeMatrix

Functions under development:
bandAssign
getPercentBandMatrix
Commit #2: Added some code to the bandMatrix function. Need to work on stdev column
Part 2 logic skeleton, saving work
quick and dirty comments
variable typo
saving work, just a bunch of comments-in-lieu-of-code
Commit #3: Finished cv_logic draft

Part 1 of Logic has been codified. (Thanks Kevin for picking up on
variable naming errors). Will be writing test drivers soon.
Commit #4: Syntax concerns.

Forgot that Python doesn't do &&, ||, and !. Also forgot a function
call.
add normal periods to the table (I.1 in spreadsheet)
refactor addMonth for more utility
updated comment above addMonth
return newDate, not aDate, in addMonth
more variable problems in addMonth
quick comments on addNormalPeriods
updating function headers
cleaning up, saving work
template for splitting into normal/transition
added transition periods
Added marking last cell within adding transition periods for now
saving work