adding python daltonize from moinmoin (modified)
calling the python script from the gem

* updated error handling
* trying to capture and raise errors back to the user
updated readme for the python version
updated readme
updated readme
adapting python version to use ruby - launching external process
merging @jcupitt's version in daltonize.rb

* daltonize.rb can be run standalone
* it is also launched from carrierwave
moved daltonize.rb to lib

* daltonize.rb code being called from carrierwave-daltonize
* no dependency on carrierwave-vips, only vips
* can be used together with MiniMagick, Rmagick etc
updated README
add alpha handling and cli version

Add alpha handling.

Add a command-line version, and an implementation in nip2 for testing,
see the README. There's a test image too.

Small clarifications to the comments.
Merge branch 'ruby' + pull #2

* moving other/daltonize.rb into lib
* updating the code and fixing small bugs
* re-using lib/daltonize.rb inside the carrierwave plugin
* updated documenation etc
removed vendor/daltonize.py (exists in python branch)
added note about CarrierWave::VIPS
updated note about CarrierWave::VIPS
adding sample images and updating readme
updated image paths
fixed typo
removed redundant daltonize.rb
fixed gemspec
bumped to 0.0.3