Added `clone` method and updated the `extend` method.
Fixed reference of array item in `extractBoolFromArray`.
Moved `extractBoolFromArray*` functions to `sjl-utils-functions.js`.
Build of last commit.
Merge pull request #4 from elycruz/extend_upgrade

`extend` upgrade to jquery styled `extend` function with our included extra feature (`useLegacyGettersAndSetters`).