Section classes should all have 'gutter' added by default

This can be removed by deleting and updating or by adding other
classes to the list
Wrap advanced controls in a DIV and hide this by default
Default section-classes are now 'gutter marginalize-ends'
Add a 'Show Advanced Controls' link to each builder section
Follow case example set by Remove this section
Add functionality to show and hide advanced controls for builder sections
Wrap the H1 in our header section with a column DIV
Merge pull request #58 from washingtonstateuniversity/update/builder

[PR] Toggle advanced controls for page builder sections