Docs rewrite for 0.8.0 release
Weave: Add deprecation notices
Make some Fezzik methods private

Fixes #47
Move color_string into bin/fez
Don't print stacktrace twice when task fails
Move TODO into the code
Deprecate Fezzik::Util.capture_output
Remove TODO
Weave: Rewrite default tasks to use 0.8.0 conventions
README tweaks