added home icon
removed separators with summary sections to make browsing with the panel more intuitive
updated version number display, now also shown as label

Fixes #2298: Fixed the bug that Gii controller generator did not allow digit in the controller ID (qiangxue)

fixes #2254

- refactored elasticsearch AR to make type and index available in
  instantiate(), issue #1313

fixes #2281

fixes #2220

issue #1797