Add WIP version of the BLENDER importer. DO NOT USE FOR PRODUCTION YET!

Loads static meshes. Sometimes (it segfaults on the rest). No materials, cameras, fancy stuff. Works with all versions of blender. No compressed blend files yet.

- StreamReader now uses shared_ptr's to manage ownership of the stream.
- Adapt other loaders accordingly.

git-svn-id: https://assimp.svn.sourceforge.net/svnroot/assimp/trunk@717 67173fc5-114c-0410-ac8e-9d2fd5bffc1f

code/FindInvalidDataProcess.cpp

@@ -44,7 +44,7 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 #include "AssimpPCH.h"
 
-#ifndef AI_BUILD_NO_FINDINVALIDDATA_PROCESS
+#ifndef ASSIMP_BUILD_NO_FINDINVALIDDATA_PROCESS
 
 // internal headers
 #include "FindInvalidDataProcess.h"
@@ -416,4 +416,4 @@ int FindInvalidDataProcess::ProcessMesh (aiMesh* pMesh)
 }
 
 
-#endif // !! AI_BUILD_NO_FINDINVALIDDATA_PROCESS
+#endif // !! ASSIMP_BUILD_NO_FINDINVALIDDATA_PROCESS