TypeError when using numpy 1.7.0

The exception:

```python
[ERROR][mcedit.py:1020]:An unhandled error occured.
Traceback (most recent call last):
  File "mcedit.py", line 1016, in main
    MCEdit.main()
  File "mcedit.py", line 960, in main
    rootwidget.run()
  File "/home/dav1d/ftbla/mcedit/albow/root.py", line 106, in run
    self.run_modal(None)
  File "/home/dav1d/ftbla/mcedit/albow/root.py", line 159, in run_modal
    self.gl_draw_all(self, (0, 0))
  File "/home/dav1d/ftbla/mcedit/albow/widget.py", line 730, in gl_draw_all
    subwidget.gl_draw_all(root, suboffset)
  File "/home/dav1d/ftbla/mcedit/albow/widget.py", line 730, in gl_draw_all
    subwidget.gl_draw_all(root, suboffset)
  File "/home/dav1d/ftbla/mcedit/albow/widget.py", line 730, in gl_draw_all
    subwidget.gl_draw_all(root, suboffset)
  File "/home/dav1d/ftbla/mcedit/albow/widget.py", line 730, in gl_draw_all
    subwidget.gl_draw_all(root, suboffset)
  File "/home/dav1d/ftbla/mcedit/albow/widget.py", line 727, in gl_draw_all
    self.gl_draw_self(root, offset)
  File "/home/dav1d/ftbla/mcedit/albow/openglwidgets.py", line 23, in gl_draw_self
    self.gl_draw_viewport()
  File "/home/dav1d/ftbla/mcedit/albow/openglwidgets.py", line 28, in gl_draw_viewport
    self.setup_matrices()
  File "/home/dav1d/ftbla/mcedit/albow/openglwidgets.py", line 37, in setup_matrices
    self.setup_modelview()
  File "/home/dav1d/ftbla/mcedit/leveleditor.py", line 1253, in setup_modelview
    self.setModelview()
  File "/home/dav1d/ftbla/mcedit/leveleditor.py", line 416, in setModelview
    look += self.cameraVector
TypeError: Cannot cast ufunc add output from dtype('float64') to dtype('int64') with casting rule 'same_kind'
```