Better calc detection & fallback, code optimisations & cleanup

[IanCaunce]

Changes

• Added better calc detection
• Added fallback support for any browser which doesn't natively support calc. (Mainly needed for android 3+ & 12.x opera)
• Various code optimisations such as removing unnecessary creation of jQuery objects & node caching.
• Code clean up by re-writing parts to the most common style in the file & removal of unnecessary comments.
• Replaced the ; with a + on the self executing function as some minifiers strip the first one out.
• Added a ! to the first comment to prevent minifiers from stripping it out by default.

I apologise in advance if I was meant to create separate pull requests for these changes. This is my first on github.

Commit: 4d9a3a8
For some unknown reason, when the parent element to the rrssb-buttons element has a percentage padding left & right, with the calc polyfill in place and the child elements widths add up to that of the parent, the last element will wrap to a newline. The 1px saftey net sorts that issue out.

Edit: The issue was caused by browsers rounding fractional pixel widths to the nearest whole pixel. This means you can end up in a situation where the width of the element is reported to be larger than it actually is. The only consistent way I can see is to - 1 off the width given. You can get the fractional width by using $('.something')[0].getBoundingClientRect().width but unfortunately .width is undefined in <= IE8.

[dbox]

Added to dev branch. will be pushed with next release. thanks!

[dbox]

Would you mind resubmitting this to the dev branch? Thanks!

[dbox]

@aicarlson Want to look at this and see if you can get it merged cleanly into latest?

[andrewicarlson]

@dbox Sure, I'll take a look later tonight.

[IanCaunce]

@dbox Done. Pull Request #89