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/deprecated.h

@@ -0,0 +1,28 @@
+// This file is part of libigl, a simple c++ geometry processing library.
+// 
+// Copyright (C) 2015 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_DEPRECATED_H
+#define IGL_DEPRECATED_H
+// Macro for marking a function as deprecated.
+// 
+// http://stackoverflow.com/a/295229/148668
+#ifdef __GNUC__
+#define IGL_DEPRECATED(func) func __attribute__ ((deprecated))
+#elif defined(_MSC_VER)
+#define IGL_DEPRECATED(func) __declspec(deprecated) func
+#else
+#pragma message("WARNING: You need to implement IGL_DEPRECATED for this compiler")
+#define IGL_DEPRECATED(func) func
+#endif
+// Usage:
+//
+//     template <typename T> IGL_INLINE void my_func(Arg1 a);
+//
+// becomes 
+//
+//     template <typename T> IGL_INLINE IGL_DEPRECATED(void my_func(Arg1 a));
+#endif