EPA: Improved check for stopping of expanding polytope.

Simple test was added. It checks whether the obtained support point can
significantly expand the polytope surrounding the origin.
Removed ccdGJKDist() and related functions and tests.

It is unfinished implementation of distance computation using GJK
algorithm. This functionality was moved to gjk-dist branch until it is
finished and properly tested.
libccd v1.5
Merge pull request #1 from danfis/master

Update to upstream 1.5