Revert "Pass in an array of image URLs rather than actual img components"

This reverts commit e8a0f10ab3dab5379f19b1b5b0a7e7835afae650.
Changed repo to react-component-gallery

This is per a twitter recommendation that component should just be able
to take any child components and render them. Much more useful that way.

Changed text + examples to demonstrate this.
0.4.0
Merge branch 'master' into gh-pages
New release