Refactor(gulpfunctions): Changed the way a new build id is calculated. The first letter of a build number is  based on the last numbers of a year (i.e. 14 in 2014). If the numbers go above 26 then non alphabetical symbols were derived. Now, using modulo 26 the numbers will wrap around. So every 26 years a build id could be the same, but it is highly likely the version number will have changed so there should not be a full version id collision. Also dropped the toUpperCase function and just used a lower Char code to get upper case letters.