Added the ability to dynamically add and remove Autotab

Added Firefox detection for two instances where it misbehaves
Added support for hexadecimal filtering
Added support to force an auto tab in $.autotab.next and $.autotab.previous
Improved support for a function format by passing the current element, useful for getting a text box's full value and allowing support for auto tabbing from a custom function
Updated $.autotab.next and $.autotab.previous with a timer to support $.autotab.next and $.autotab.previous calls after a keypress event has finished but the maxLength hasn't been reached
Refactored how settings are stored because of issues that came up when testing the add/remove functionality with the previous storing method
Refactored the code for stricter evaluations
Fixed a bug with a selector finding no matches but .autotab still being called with an empty set
Fixed an issue in Firefox where periods were shown twice in fields that allowed them.
Updated demo with latest features
Forgot to include previous Firefox fix in the min
Removed unnecessary force parameter from $.autotab.next and $.autotab.previous
Added optional flag 'disable', which does the same thing as 'remove' or 'destroy'
Added support for restoring auto tab and filtering functionality

Updated demo with new restore feature
Updated README with latest plethora of changes
Updated CHANGELOG with 1.3 changes
Merge pull request #7 from Mathachew/dev

1.3 Update