use exit code
Merge pull request #19 from Simn/master

use exit code
Merge branch 'master' of github.com:polygonal/ds into dev

Conflicts:
	test/UnitTest.hx
cast null -> int
implement IntIntHashTable.clrPair()
#if cpp workarounds no longer required
Merge branch 'dev' of github.com:polygonal/ds into dev