options classes

[mousemke]

we can add classes but right now they appear to replace the default class. we need them to be in addition to the default class for structural reasons

[mousemke]

if there is an extra class defined it replaces the default instead of adding it in addition. This could lead to structural errors https://github.com/sociomantic-tsunami/flounder/blob/master/src/core/flounder.js#L347-L352