Added SEO capabilities

@jasonlemay Just look at the config.xml files. 
Each lower level overrides the upper level, except for title. Lower levels titles are prepended (ie "Mixins - GSSS - Arcbees Developers Site") would be generated when writing
`title="Mixins"` in the mixins folder config.xml, `title="GSSS"`in the GSSS level config.xml, and `title="Arcbees Developers Site"` at the root config.xml