Performance improvements for initIndent.

[joeblubaugh]

Saves about 20% wall clock time when initializing large tables.

[otisg]

Would this help with #11 / #18?

[Blood-dm]

This breaks deeper indents above 2 levels. The following code works though:

var expander = $this.find('.treegrid-expander');
var depth = $this.treegrid('getDepth');
for (var i = 0; i < depth; i++) {
    $($this.treegrid('getSetting', 'indentTemplate')).insertBefore(expander);
}

[maxazan]

Thank you for your help. Try new release of plugin.
http://maxazan.github.io/jquery-treegrid/examples/example-huge.html