More label colors

Fixes #191 

See #191 for the colors that I picked.

````css
/* 
 * The kex-labelstyle-tag* colors are all colors that can be shown together to highlight 
 * different tags. Currently these colors consist of blue, green, yellow, and grey.
 */
.kex-labelstyle-bright-blue, .kex-labelstyle-tag-1 {
  background-color: #84b6eb !important;
  color: #1c2733 !important;
}

.kex-labelstyle-light-yellow, .kex-labelstyle-tag-2 {
  background-color: #fef2c0 !important;
  color: #333026 !important;
}

.kex-labelstyle-light-green, .kex-labelstyle-tag-3 {
  background-color: #bfe5bf !important;
  color: #2a332a !important;
}

.kex-labelstyle-light-blue, .kex-labelstyle-tag-4 {
  background-color: #bfdadc !important;
  color: #2c3233 !important;
}

.kex-labelstyle-light-gray, .kex-labelstyle-tag-5 {
  background-color: #cccccc !important;
  color: #333333 !important;
}
````