Update zipCode.js

Added the letters 'W' and 'Z' in the second and third letter list for Canada postal code.
Merge branch 'zipCode_ca' of https://github.com/jzhang6/bootstrapvalidator into jzhang6-zipCode_ca

Conflicts:
	src/js/validator/zipCode.js
Merge branch 'jzhang6-zipCode_ca'