Refactored pager support to not rely on pydoc
Unbroke colorama integrated echo for unicode.
Test with and without colorama
Added an example for the terminal ui functions
Linked to termui example
Ensure we do not strip color codes for bytes.
Fixed a test on python 3
Added support for current item display to progressbar.
Calculate line length correctly
Merge branch 'pr/95'
Added a test for empty nargs
Added support for screen clearing.
Updated termui script to also have a clear command.
Make clear() a noop if not connected to a terminal.
Added colorama example
print -> click.echo
Added 2x images to docs for retina display support
Added media query detection for retina displays
Changed parameter callback signature.
Added __version__ attribute