Removed ChangeLog and old README.txt

git-svn-id: http://svn.gna.org/svn/etoile/trunk/Etoile/Frameworks/UnitKit@10367 7b3f36aa-e6db-49c1-8b4c-66eac1997e64
Updated README with explanations for creating test suites on OS X, iOS and GNUstep

git-svn-id: http://svn.gna.org/svn/etoile/trunk/Etoile/Frameworks/UnitKit@10368 7b3f36aa-e6db-49c1-8b4c-66eac1997e64
Renamed NEWS to NEWS.md and updated Xcode project for recent file name changes

git-svn-id: http://svn.gna.org/svn/etoile/trunk/Etoile/Frameworks/UnitKit@10369 7b3f36aa-e6db-49c1-8b4c-66eac1997e64