#36 (Comments modified to correspond JSDoc better) Text units fails on IE9
#35 (Used Number.prototype.toFixed method to convert numbers to strings inside JSON.stringify) Serialization fails on Opera 11.15
#35 (small fix in primitives.js) Serialization fails on Opera 11.15
#35 (1.moved replacer method into Util 2. apply Opera replacer to save(...) and saveAs(...)  3. update test unit)Serialization fails on Opera 11.15