Closes #58 - Sprockets no longer handles css compilation.

It is the sass compiler's job now.

Also refactored base.css.scss so that is properly contains no css elements... Because it needs to be imported into other places, it cannot contain other css - other wise it will be duplicated.

modified:   app/assets/stylesheets/_base.css.scss
modified:   app/assets/stylesheets/_layout.css.scss
modified:   app/assets/stylesheets/application.css.scss
renamed:    app/assets/stylesheets/analysis_items.css.scss -> app/assets/stylesheets/partials/_analysis_items.css.scss
renamed:    app/assets/stylesheets/analysis_jobs.css.scss -> app/assets/stylesheets/partials/_analysis_jobs.css.scss
renamed:    app/assets/stylesheets/analysis_scripts.css.scss -> app/assets/stylesheets/partials/_analysis_scripts.css.scss
renamed:    app/assets/stylesheets/_annotation_viewer.css.scss -> app/assets/stylesheets/partials/_annotation_viewer.css.scss
renamed:    app/assets/stylesheets/_audio_events.css.scss -> app/assets/stylesheets/partials/_audio_events.css.scss
renamed:    app/assets/stylesheets/_audio_recordings.css.scss -> app/assets/stylesheets/partials/_audio_recordings.css.scss
renamed:    app/assets/stylesheets/_bookmarks.css.scss -> app/assets/stylesheets/partials/_bookmarks.css.scss
renamed:    app/assets/stylesheets/_home.css.scss -> app/assets/stylesheets/partials/_home.css.scss
renamed:    app/assets/stylesheets/_listen.css.scss -> app/assets/stylesheets/partials/_listen.css.scss
renamed:    app/assets/stylesheets/_login_control.css.scss -> app/assets/stylesheets/partials/_login_control.css.scss
renamed:    app/assets/stylesheets/_permissions.css.scss -> app/assets/stylesheets/partials/_permissions.css.scss
renamed:    app/assets/stylesheets/_photos.css.scss -> app/assets/stylesheets/partials/_photos.css.scss
renamed:    app/assets/stylesheets/_progresses.css.scss -> app/assets/stylesheets/partials/_progresses.css.scss
renamed:    app/assets/stylesheets/_projects.css.scss -> app/assets/stylesheets/partials/_projects.css.scss
renamed:    app/assets/stylesheets/_record_information.css.scss -> app/assets/stylesheets/partials/_record_information.css.scss
renamed:    app/assets/stylesheets/_saved_searches.css.scss -> app/assets/stylesheets/partials/_saved_searches.css.scss
renamed:    app/assets/stylesheets/_scaffolds.css.scss -> app/assets/stylesheets/partials/_scaffolds.css.scss
renamed:    app/assets/stylesheets/_sites.css.scss -> app/assets/stylesheets/partials/_sites.css.scss
renamed:    app/assets/stylesheets/_tags.css.scss -> app/assets/stylesheets/partials/_tags.css.scss
renamed:    app/assets/stylesheets/_users.css.scss -> app/assets/stylesheets/partials/_users.css.scss