TEST: Call tests for Linux
Merge branch 'master' of git://github.com/dockimbel/Red into call

Conflicts:
	tests/source/library/call-test.r
	tests/source/library/call-test.red
FEAT: Block! type added to call cmd and input parameters
FEAT/ Unix shell detection for /shell refinement
FEAT: Shell refinement added
FIX: Remove useless var
FEAT: Call now returns process exit code
FIX: Removed unused function binding
Merge pull request #741 from be-red/call

Call : /shell refinement added, now returns process exit code