feat(popover): add popover-html-unsafe directive

[dcg]

This Feature enables the User to add HTML-Formatted Content to a popover

See: Issue #520

[pkozlowski-opensource]

@joshdmiller How do you feel about this one? IMO we should focus on #220 (which would solve this issue as well) but at the same time this is rather simple change...

[pkozlowski-opensource]

BTW a13740c is a separate thing, right? We've got a PR for this already (#389) but we are still debating IE8 support

[dcg]

a13740c shouldn't be in this PR it's indeed the same as #389

[dcg]

Sorry, this is my first PR. is there a way to remove Commit a13740c from this PR?

[pkozlowski-opensource]

@dcg you would have to do:

• git reset HEAD~1
• git push --force

But don't worry, we can pick-up only a relevant commit.

[dcg]

I removed a13740c just to keep it clean.

I think that #220 is kind of another problem. If you use popovers as a kind of big tooltips the inline option is nice and with less overhead. Also it keeps things consistent with tooltips.

e.g.

<a href... popover-unsafe-html="This is a Help but please <b> focus </b> on this"> ...

[pkozlowski-opensource]

@dcg unsafe-html is a hack really and I would rather focus on getting support for #220. We've introduced the "unsafe" version for tooltips as you don't usually put much markup in those. But for popovers it will be really a pain... So I would really prefer to focus on #220 that is going to address this issue (and many others as well!)