This update includes new features and minor bug fixes. In addition, APLpy now
requires Matplotlib 0.99 to be installed.

New Features
~~~~~~~~~~~~

- methods such as show_contour, show_markers, etc. now return the
  contour, marker, etc. object
  
- added a method to retrieve the object in a specific layer:
    -> get_layer()

- ability to show the beam for the observations:
    -> show_beam()
    -> hide_beam()
    -> set_beam_properties()
  
- added the ability to show/hide only the x or y axis/tick labels:
    -> show_xtick_labels()
    -> hide_xtick_labels()
    -> show_ytick_labels()
    -> hide_ytick_labels()
    -> show_xaxis_labels()
    -> hide_xaxis_labels()
    -> show_yaxis_labels()
    -> hide_yaxis_labels()
    
- convenience functions for world to pixel and pixel to world
  conversion:
    -> world2pixel()
    -> pixel2world()
  
- added a convention= argument to FITSFigure() and show_contour(). This is
  to be used in cases where the WCS interpretation is ambiguous. For
  example, a -CAR projection with CRVAL2<>0 can be interpreted in two
  different ways. If an ambiguous case pops up, APLpy will raise an
  exception and ask for the convention to be specified.

API changes
~~~~~~~~~~~

- set_labels_latex() is now set_system_latex()

Bug fixes
~~~~~~~~~

- the current position of the cursor in world coordinates is now correctly
  shown in interactive mode
  
- fixed an issue which caused RGB FITS cubes to be 64-bit

- fixed a bug which meant that the coordinate grid was not updated
  immediately during pan and zoom