(maint) Move all deprecated methods into dedicated section of 00_utils

This commit moves all currently deprecated methods into a newly created
section at the bottom so that we can easily see which methods have not
yet been moved into Pkg libraries.
Merge pull request #329 from haus/maint/master/move_deprecated_methods

(maint) Move all deprecated methods into dedicated section of 00_utils
(CPR-8) Rake task for signing gems

This commit adds a sign_gem task into sign.rake that detached signs the
gem.