Update class exists check

For one, I think this is backwards. Also, for some reason returning in
the global scope like this doesn’t seem to work reliably. You’re better
off doing the check and then continuing if the class doesn’t already
exist.
Formatting cleanup & optional section description

This file had a lot of mixed tabs and spaces and the alignment needed
some adjustment. I also added an early return for when there are no
options and an optional description field for the customizer sections.
Missed some formatting stuff
Merge pull request #4 from FlagshipWP/development

Update class exists check.
Merge pull request #5 from FlagshipWP/descriptions

Add optional section description & cleanup formatting.
Add version and changelog.
Bugfix: customizer.js enqueue relative to library.
Improve docs for media param.
Add documentation for .
Use native textarea control from core.
Simplify logic in interface.
Allow upload control.
Merge branch 'master' into development
Added composer.json
Merge pull request #15 from FlagshipWP/composer

Add Composer Support
Refactor interface.
Fix upload control.
Fix textdomain.