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/grid.h

@@ -0,0 +1,32 @@
+// This file is part of libigl, a simple c++ geometry processing library.
+// 
+// Copyright (C) 2016 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_GRID_H
+#define IGL_GRID_H
+#include "igl_inline.h"
+#include <Eigen/Core>
+namespace igl
+{
+  // Construct vertices of a regular grid, suitable for input to
+  // `igl::marching_cubes`
+  //
+  // Inputs:
+  //   res  3-long list of number of vertices along the x y and z dimensions
+  // Outputs:
+  //   GV  res(0)*res(1)*res(2) by 3 list of mesh vertex positions.
+  //   
+  template <
+    typename Derivedres,
+    typename DerivedGV>
+  IGL_INLINE void grid(
+    const Eigen::MatrixBase<Derivedres> & res, 
+    Eigen::PlainObjectBase<DerivedGV> & GV);
+}
+#ifndef IGL_STATIC_LIBRARY
+#  include "grid.cpp"
+#endif
+#endif