Adds isNode check.

[artemruts]

Overview

Adds isNode check for nodes A and B when checking if A.contains(B).
This should prevent IE10 errors for hover events, for more details please refer to pt:7458101.

Details

Function was tested on:

Windows 7

• IE 8
• IE 9
• IE 10
• IE 11
• Safari 4
• Safari 5.1
• Firefox 42
• Firefox 49

OSX Sierra

• Safari 10
• Opera 32
• Opera 40
• Chrome 47
• Chrome 56

iOS

• iPhone 4, iOS 4, Safari
• iPhone 6, iOS 8, Safari
• iPhone 7, iOS 10, Safari

Android

• Galaxy S2, Android 2.3
• Nexus 6p, Android 7

[codecov-io]

Current coverage is 84.85% (diff: 100%)

Merging #277 into master will increase coverage by 0.08%

@@             master       #277   diff @@
==========================================
  Files           119        119          
  Lines          6511       6519     +8   
  Methods           0          0          
  Messages          0          0          
  Branches          0          0          
==========================================
+ Hits           5520       5532    +12   
+ Misses          991        987     -4   
  Partials          0          0          

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[danieluhl]

Looks good to me

[artemruts]

Hey @MattDeeg, does this make sense to you? If yes, could you approve please?