Make custom color picker with sliders

[marcin-wosinek]

Use slider to set colors of a note.

Looks that the styles need to be set in our custom style.

/*!
 * Angular Material Design
 * https://github.com/angular/material
 * @license MIT
 * v0.6.1
 */
md-backdrop.md-opaque.md-red-theme {
  background-color: rgba(0, 0, 0, 0.3);
  position: absolute; }

md-bottom-sheet.md-red-theme {
  background-color: #fafafa;
  border-top-color: #bdbdbd; }
  md-bottom-sheet.md-red-theme.md-list md-item {
    color: rgba(0, 0, 0, 0.54); }
  md-bottom-sheet.md-red-theme .md-subheader {
    background-color: #fafafa; }
  md-bottom-sheet.md-red-theme .md-subheader {
    color: rgba(0, 0, 0, 0.54); }

[marcin-wosinek]

Please take a look at #7 first.

[grzim]

done