Removes inline styles (DEVELOPER-832)

This removes all inline styles, I've replaced them with classes where I
could. The one place this hasn't worked out is in the microsite hero
image. We'll need to figure that one out.

Adding in the default microsite hero banner.
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Add image instructions to CONTRIBUTING.md
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Merge pull request #638 from pmuir/image_contributions

Add image instructions to CONTRIBUTING.md
Merge pull request #613 from LightGuard/DEVELOPER-832

Removes inline styles (DEVELOPER-832)
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DEVELOPER-1083 Requesting home page promo to support JBoss Fuse for xPaaS launch
DEVELOPER-1075 Updates to jboss.org/product/fuse page to support xPaaS launch
DEVELOPER-1076 Updates to jboss.org/product/amq page to support xPaaS launch
Merge pull request #637 from paulrobinson/DEVELOPER-1078

Developer-1078 xPaaS changes
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