Proper algorithm improvements
* Improvements have been made to GetShortestPathTo() and SkillNodeList()
Pushing 2.1.1pre3 for another fix to GetShortestPathTo()
Some cleaning in SkillNodeList
More fixes to SkillNodeList and GetShortestPathTo

To much was removed so had to add stuff back for it to work as it
should.
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Fixes #63
Merged upstream changes.