Removed controls around the heading

See issue #131
Split concept resources into two columns

See issue #131
Fixed missing concepts from list of resources

This is a little bit of a hack, but is a lot cleaner than the non-hack version

See issue #131
Styled the header of the concept page

See issue #131
Fixed resource summary url
Added understanding slider to the conept page

This works, except understandings are overridden by resource understandings.

See issue #131
Merge pull request #142 from kennib/concept-page

Concept page