Make separate minified js and css files for each html file

[netbymatt]

The overlaps didn't work out as expected, unfortunately. Additional things to consider:

• Leave jquery out of it, and load from a CDN for production
• slightly modify the structure of the modules folder so additional modules can be added without the need to update the gulp script

[netbymatt]

66cef7f04e073eb90f17246084e485b6a03da0cb