Create post modal

#### Color Scheming

* Initial pass at color scheming for use in core design as well as user theming.

* using https://github.com/Team-Sass/color-schemer

#### Choose Form Modal

* styled `ChooseForm.html` modal

* added <li> to 'ChooseForm.html' for UI design purposes. These can be removed and dynamically generated when needed.

#### General

* removed @extend .box-shadow
* made all box-shadows mixins

* Moved a bunch of files to improve the directory structure