Update tri and cube with stage

These changes were cherry-picked from nvidia-dev-20150218 and
KhronosGroup/GDC-stable.
diff --git a/demos/zlib/contrib/delphi/ZLibConst.pas b/demos/zlib/contrib/delphi/ZLibConst.pas
new file mode 100644
index 0000000..cdfe136
--- /dev/null
+++ b/demos/zlib/contrib/delphi/ZLibConst.pas
@@ -0,0 +1,11 @@
+unit ZLibConst;
+
+interface
+
+resourcestring
+  sTargetBufferTooSmall = 'ZLib error: target buffer may be too small';
+  sInvalidStreamOp = 'Invalid stream operation';
+
+implementation
+
+end.