Add a hit tolerance to feature selection model.

[simonseyock]

No description provided.

[coveralls]

Pull Request Test Coverage Report for Build 924231335

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.1%) to 81.177%

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Totals
Change from base Build 885980754:	0.1%
Covered Lines:	1383
Relevant Lines:	1630

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💛 - Coveralls

[chrismayer]

Code looks good to me. Please have a look at the failing tests...not sure if this is related or not.

[simonseyock]

I had to improved the test :D

[simonseyock]

I also fixed an error with destroying an associated grid. ExtJs calls bindComponent during destroy (which still seems very strange to me). This was causing a rebind on destroy, which is not desirable.