+ added jshintrc.
 * added 'scrollPos' option to  datatable and format code.
 * ajusted javascript code with jshint.
 * ajusted code format.
 * added juqery check code to jquery.extensions.js.
 * method 'load' support jquery selector.
 * datatable columns support 'ignore' option.
 + added jshintrc.
 * fixed error: datatable footer empty sometimes.
 * changed version, fixed image cutter path.
 * fixed error when bind resize event on window object.
 * updated package.json.
 * updated gitignore.
 * fixed reference in icons.less for chanzhi build.
 * added real checkbox input to datatable support checkable.
 * enhanced messager.
 * added show function to $.messager.
 * messager can display on the center of the screen.
 * updated document for messager.
 * return the messager object when call a quick show method.