make mechanize a development dependency
Merge pull request #6 from tomharris/1fc0ba8853e893c6ce1f80cecd414f28664dcd0a

Remove Mechanize as a runtime dependency
Move to Spreedly organization
Fix for Hoe.
Modernize packaging
Improve auth failure hanlding
Ignore generated gems
Add gemspec description
Add license to gemspec
Add invoice accessors
Merge remote-tracking branch 'upstream/master'
Remove old gemspec