Building igl statically and moving to the dep scripts

Fixing dep build script on Windows and removing some warnings.

Use bundled igl by default.

Not building with the dependency scripts if not explicitly stated. This way, it will stay in
Fix the libigl patch to include C source files in header only mode.

src/libigl/igl/point_in_poly.h

@@ -0,0 +1,36 @@
+// This file is part of libigl, a simple c++ geometry processing library.
+// 
+// Copyright (C) 2013 Alec Jacobson <alecjacobson@gmail.com>
+// 
+// This Source Code Form is subject to the terms of the Mozilla Public License 
+// v. 2.0. If a copy of the MPL was not distributed with this file, You can 
+// obtain one at http://mozilla.org/MPL/2.0/.
+#ifndef IGL_POINT_IN_POLY_H
+#define IGL_POINT_IN_POLY_H
+#include "igl_inline.h"
+
+#include <vector>
+
+namespace igl
+{
+  // Determine if 2d point is inside a 2D polygon
+  // Inputs:
+  //   poly  vector of polygon points, [0]=x, [1]=y. 
+  //         Polyline need not be closed (i.e. first point != last point), 
+  //         the line segment between last and first selected points is constructed 
+  //         within this function.
+  //   x     x-coordinate of query point
+  //   y     y-coordinate of query point
+  // Returns true if query point is in polygon, false otherwise
+  // from http://www.visibone.com/inpoly/
+bool IGL_INLINE point_in_poly( const std::vector<std::vector<unsigned int > >&poly, 
+            const unsigned int xt, 
+            const unsigned int yt);
+
+}
+
+#ifndef IGL_STATIC_LIBRARY
+#  include "point_in_poly.cpp"
+#endif
+
+#endif