* turn readSTEP into a truly async function

* add a mutex to prevent two concurrent readSTEP operation as OCC doesn't truly support multithreading

Author: erossignon

package.json

@@ -8,7 +8,8 @@
     "colors": "latest",
     "file-utils": "*",
     "temporary": "0.0.5",
-    "gettemporaryfilepath": "0.0.1"
+    "gettemporaryfilepath": "0.0.1",
+    "progress": "~0.1.0"
   },
   "devDependencies": {
     "grunt": "~0.4.1",

src/OCC.h

@@ -90,6 +90,8 @@
 
 #include <Interface_Static.hxx>
 
+#include "Message_ProgressIndicator.hxx"
+
 //xx #include <MgtBRep.hxx>
 
 #include <Poly_Triangulation.hxx>
@@ -127,6 +129,9 @@
 #include <TopoDS_Edge.hxx>
 #include <TopoDS_Wire.hxx>
 #include <TopoDS_Face.hxx>
+#include <Transfer_TransientProcess.hxx>
+#include <XSControl_WorkSession.hxx>
+
 
 
 #undef Handle