Include required JS assets for core blocks (fixes elemental theme pages)

jQuery was being loaded **only on the home page** of the Elemental theme, resulting in some broken JS - including the mobile menu - on all other pages of the default installation. The **Image** block requires jQuery, as does the responsive template of the **Auto Nav** block.

The reason the home page worked is because jQuery was being included by the **Image Slider** block on the home page.

-Steve