Add tests for uncovered lines

 There was already some space reserved as a guard, added check for writes
 before the beginning of the buffer. Did not change the 'overrun' message.
 Underrun buffer writes are likely to be a more rare case.

 This feature removes the dependency on malloc/free for constrained
  embedded systems without a heap. It uses a static heap inside
  Unity Fixture. Setting UNITY_INTERNAL_HEAP_SIZE_BYTES sizes the heap.
 Add tests for new option, add targets to makefile for running tests.
 UNITY_FIXTURE_MALLOC for Fixture use only, remove from unity_output_Spy.c.

 Revert part of commit 77af37ad, code looked like a temporary change
 The behavior is back to the original, printing "....!..." in quiet mode
 Added an ignored test to Fixture for visual inspection

At the start of unity_free(), check mem for NULL, and return immediately
if it is, so we don't crash in this case. This mimics the behaviour of
most free() implementations. Closes #135.
Signed-off-by: NGergely Nagy <algernon@madhouse-project.org>

updating CLI for unity_fixture.h to handle unknown command line arguments (instead of entering an infinite loop)

git-svn-id: http://unity.svn.sourceforge.net/svnroot/unity/trunk@106 e7d17a6e-8845-0410-bbbc-c8efb4fdad7e