Add a draggableRangeOnly options.

[ValentinH]

As asked in #196 and #199.
Demo: http://jsfiddle.net/opnrb0hL/

@FantasyLions @yelnar is it what you wanted?

[fantasylion]

yes! is awesome.Maby can add this feature:move the whole slider when you drag the handle

[yelnar]

Cool! And also I think it is would be better if two edges of slider was draggable too. Thank you.

[ValentinH]

Indeed you are both right. I just added what you wanted and also keyboard support.

[yelnar]

@ValentinH great, thanks!

[codecov-io]

Current coverage is 39.76%

Merging #203 into master will decrease coverage by -1.07% as of 02fb4aa

@@            master    #203   diff @@
======================================
  Files            1       1       
  Stmts          578     601    +23
  Branches         0       0       
  Methods          0       0       
======================================
+ Hit            236     239     +3
  Partial          0       0       
- Missed         342     362    +20

Review entire Coverage Diff as of 02fb4aa

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