Updates to Mosaic plugin

- and some small enhancements to Timer
Fixes for WCS on mosaiced images
Updates to Mosaic plugin and introducing the Pipeline plugin

- added beginnings of a new Pipeline plugin which offers a simple
  quick look style data reduction (currently bias and flats)
- Pipeline can be combined with Mosaic to create flats and biases for fields
  with multi-ccd imagers
Updates to Pipeline plugin

- properly generates independent result image
- "Save As" feature added to FBrowser plugin
Added ability to drag and drop files from the FBrowser plugin
Updated Info plugin to handle verbose names more gracefully

- layout is improved
Fix for info readout in cases where max/min are not calculated
Small improvements to mosaicing
Roll up of minor updates to wcs routines

- moved several calculation methods from AstroImage class to wcs module
- separated wcs library encapsulation to new wcsmod module
- updates to a few code routines to reflect these changes
- updated Pick module to calculate cdelt1/2 for starsize
  - fixes case where it gave an error for images without CDELTn keywords
Bug fix for Preferences plugin

- broke due to recent changes in wcs module
Rollup of small fixes

- fixed bug in parsing of DEC strings (wcs.py)
- updated Task module to use with clauses instead of try/finally
Major update for scale (mapping) algorithms

The scaling algorithms (for mapping data values during rendering) have
been completely refactored.  They are now separated from the RGBMap class
and are pluggable.  Furthermore I have redone them modeled after the ds9
algorithms described here: http://ds9.si.edu/doc/ref/how.html

There are now seven algorithms available: linear, log, power, sqrt, squared,
asinh, sinh

The Preferences plugin has been updated to make the function a little
clearer, since there is some confusion also with the intensity map feature
that is part of the final color mapping process.
Added 'squared' option
Added histogram equalization to the list of mapping algorithms

- still not perfect, but very useable
Fixed the color bar to properly change scale when the scale mapping changes.
Add keyboard and mouse controls for changing mapping algorithm

- added an example file that shows the standard bindings
- added a keyboard control for cycling through the mapping algorithms
   (default is 's'--use 'S' to reset to "linear")
- added a mouse control for cycling through the mapping algorithms
   using the scroll wheel.  It is not enabled by default.
- updated documentation on color mapping and whats new
- bumped version
Modified quick reference document for controls.

- reflects new functions for cycling color distribution algorithm and
    toggling behavior of flip/swap axes.
Added methods to change color distribution algorithm to ImageView class

- and examples for changing it "remotely" to RC plugin
Updates to color distribution

- changed confusing name of module from Scale to ColorDist and changed
    some method names respectively
- updated Preferences plugin to display related areas more closely together
- updated documentation and preferences screenshots
Bumped release