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Ext.ux.grid.column.ProgressBar
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### Description

A simple column that renders a progress bar in a grid cell.
The progress bar is imageless and uses canvas to render,

### Usage

Ext.define('Sample.Grid',{
    
    extend: 'Ext.grid.Panel',
    requires: ['Ext.ux.grid.column.ProgressBar'],

    store: Ext.create('Ext.data.Store', {
        //....
    }),

    columns: [
        {header: 'Name', dataIndex: 'name', flex: 1},
        {
             xtype: 'progressbarcolumn',
             dataIndex: 'usage',
             header: 'Usage',
             width: 100
        },
    ]
});

### Todo

1. Fallbacks if browser doesn't support canvas, use div instead
2. More color options
3. More configurations
4. By product - standalone progress bar

### Credits

- ExtJS4