* fixed an error in board.js.
 + added kityminder.
* changed @grid-gutter-width setting.
 * fixed width of droppable shadow.
 * ajusted variables setting: btn-default-bg.
 * remove unused icons form chosen icons.
 + added chart.line.js.
 * updated chart.line.js.
 * ajusted variables of article view.
 * ajsuted color and text layout.
 * ajusted order of buttons for bootbox modal.
 * ajusted code of droppable.js.
 * rebuilt zui.
 * added new type 'custom' to the modal trigger.
 + added image ready to get real size of an image before loaded.
 + updated lightbox.
 * fixed an error of modal.trigger.js.
 * updated lightbox.
 * added new theme to zentao.
 * ajusted themes of zentao.
 * fixed themes of zentao.
 * updated documents/index.
 * deleted kityminder.
 * extended jquery object with uuid method to generate universally unique identifier .