Update version string to 2.5.1-pre.6
BHV-13376: make Spotlight can't throws exception in freeze function
Merge pull request #142 from enyojs/BHV-13376-SungbaeCho

BHV-13376: make Spotlight can't throws exception in freeze function
Reviewed - by Art Dahm (art.dahm@lge.com)
Merge branch 'master' into ENYO-19

Conflicts:
	enyo.Spotlight.js
	version.js
re-adding changes originally from 3aa9a8f8ceef7f5814387e4e3e8112070caf55a9

Enyo-DCO-1.1-Signed-Off-By: Cole Davis (cole.davis@lge.com)