pull over latest Less styling updates to the Sass directory

remove some repetitive comments from the Sass files.

Move the label and form > * selectors from input to general. (maybe input should be renamed forms and all form elements get put back in there?)
ABCSSified Less files
rename input.scss to forms.scss and add form styling from general to renamed forms.scss file
Merge pull request #33 from owenversteeg/port_less_to_sass_round2

pull over latest Less styling updates to the Sass directory as well as ABCSSifying the Less files and converting input to forms.scss