CRM: Browser detection

[nbarnwell]

This issue is from the card created by Alastair on the LeanKitKanBan board we were using:

IE6 (7?) probably shouldn't be supported.

[BPScott]

We're currently basing our browser support off what Bootstrap supports, which is:

• Latest Safari
• Latest Google Chrome
• Firefox 4+
• Internet Explorer 7+
• Opera 11

We are using a X-UA-Compatible meta tag which forces IE to use it's latest rendering engine or chrome frame (if installed).

We are automatically poping up the chrome frame install overlay prompt to IE6 users (as it can now be installed without admin rights). We might want to look at a better flow for this, like a banner across the top of the page with a bit more info but this is really low priority.

CSS targeting of old IE versions is handled by a conditional class on the html element (more info on this technique here).

IMO that's our bases covered.