Advance Row Selection - Extension

A **dGrid** extension for performing actions like **Select All/Inverse/None**
Added **dijit widget - Button** at the top of grid's Header in three columns using same classes and tags as normal grid columns do.
Also fixed on bug when tested with different extensions in
**Column Resizer** extension.

![dgrid](https://f.cloud.github.com/assets/2958292/2060323/232c7124-8c0e-11e3-8b50-6d64bc32cd68.JPG)