Removed unused variable.
Experimental SteerForFear

Trying it out on a personal project.  Consider it likely to change
in the near future.
Included TickedPriorityQueue license
We can now set a desired direction on SteerForForward
Cleanup: Removed unused variable
Handling case of destroyed obstacles (in case of slow radars)
BUGFIX/IMPROVEMENT: Handling possibly destroyed objects
Updating beta version in the readme
UnitySteer 2.5b4. Merging development changes

I have been using 2.5b4 on Hairy Tales for months with only minor
changes and fixes, so it's close enough to stable that this will
likely be the last beta before 2.5 proper.  Interfaces are likely
to remain stable.