data attribute prefixed in popover

[xbill82]

Hi, I found an issue in the popover plugin.
In the plugin definition, a data variable is filled with $this.data('bs.popover');. Then, just below, a check is performed:
if (!data) $this.data('bs.popover', (data = new Popover(this, options)))
Which means: if no popover was instantiated before, then create a new one.

The issue in my prefixed code is that the data assignation was prefixed, like

$this.data('bs.tb-popover')

but the creation was not, like the following

if (!data) $this.data('bs.popover', (data = new Popover(this, options)))

which caused a new popover to be created on top of the previous one at every toggle.

I would be really glad to submit a pull request but I have no experience coding in python, and I have actually no opinion (nor any clue) about whether data attributes used by jQuery should be prefixed or not.