Remove method, prefix and suffix from dataset formatter
Include index as second argument of appendColumn and appendRow
Dataset append/insert includes index w/ callback, update only updates when values are returned from callback
Add formatRow/formatColumn, accepts callback with current value+index as args
Refactor updateRow and updateColumn
First argument is now the existing value, for easy modification (replaces formatRow and formatColumn)
Update docs to demonstrate new updateRow/Column method signatures
Update unit tests for new updateRow/Column method signatures
Delete formatRow and formatColumn methods
Remove comma/decimal and string formatting from format.js (now just used for type casting and replacement
Clean up format.js, remove defaults hash, delete dead code
Merge pull request #178 from keenlabs/fix/beta-bugs

Updates to Dataset row/column access methods