Update to latest version of rangeslider.js and fix various RTL issues

[NayanKhedkar]

fixes adaptlearning/adapt_framework#1318, adaptlearning/adapt_framework#1597 and adaptlearning/adapt_framework#1350

[sarveshwar-gavhane]

can we wait till andreruffert/rangeslider.js#245 this PR gets merged into rangeSlider first ? , otherwise every time when we upgrade the rangeSlider we have to manually make the changes for RTL.

Awaiting rangeslider.js library merge

[brian-learningpool]

@NayanKhedkar, is it possible for you to respond to @tomgreenfield's comments on andreruffert/rangeslider.js#245? This PR has been hanging around for some time.

[NayanKhedkar]

@brian-learningpool and @tomgreenfield initial css no more required.I updated css on same PR.

[moloko]

Once andreruffert/rangeslider.js#245 is merged and we can come back to this again, please can we make sure to test against the framework using JQuery 3.1.x to check that version of JQuery doesn't still cause this bug?

[moloko]

OK well there's been very little movement on the rangeslider repo in the past year (just four commits) so I appreciate what @sarveshwar-gavhane is saying I do thing we should just go ahead and then manually amend for the RTL fixes.
hopefully getting this in will also allow us to finally update to JQuery v3.

[sarveshwar-gavhane]

sounds good @moloko and this PR has been hanging around near about a year(December to nov) now, i don't think so range Slider does care about RTL as we do in Adapt, they are not interested to either reviewing or merging
i think we should move ahead if everyone is happy.

[NayanKhedkar]

I have updated the latest rangeslider.js(v2.3.1) with few changes to rtl feature. So can we go ahead and merge this PR, instead of waiting for the PR: andreruffert/rangeslider.js#245 to merge. @moloko @tomgreenfield @brian-learningpool can you please review the PR?

[moloko]

OK, we're looking pretty good! I've tested this in RTL mode across IE11, Firefox, Chrome, Edge, Safari for iOS11 (iPhone and iPad) and it's all looking great. As far as I can see it fixes all the related issues.