Version bump to 0.8.2
Adjust for the latest jeweler (1.8.4)

TODO: switch to the pure bundler soon
Version bump to 0.8.3
Regenerate gemspec for version 0.8.3
Version bump to 0.8.4
Regenerate gemspec for version 0.8.4
Version bump to 0.8.5
Version bump to 0.8.6
Switch to the new jeweler rake tasks

Avoid recursive dependency:

Fetching: workflow-0.8.4.gem (100%)
ERROR:  Error installing workflow:
    workflow requires workflow (>= 0)
Regenerate gemspec for version 0.8.6
Fix test dependencies (gems)
Switch from jeweler to pure bundler for building gem