Update jeweler gem to 2.0.1
Test against all Ruby 2.1.x versions
Merge branch 'master' of git://github.com/johankok/epubinfo into johankok-master

Conflicts:
	Gemfile.lock
Merge pull request #15 from johankok/master

The syntax for the rubyzip gem was somewhat changed in version 1.0. My
project already required the latest rubyzip and that conflicted with the
0.9.9 requirement from epubinfo. I've updated epubinfo to use the new
syntax. Would it be possible to merge this and release a new version of
the epubinfo gem? Thanks!
Version bump to 0.4.4
Add changelog for 0.4.4
Regenerate gemspec for version 0.4.4
Fix typos in README