Merge pull request #14 from spike78/master

Update specifications for Avery 5160
Avery 6871 Label Type

Print-to-the-Edge Address Label, 18 per sheet
Update README.md

The title should fix on one line please and thank you
API for passing Prawn::Document parameters

based on suggestion from @jordanbyron
the options hash can now include a documents hash - these parameters are
passed down to prawn, so any other options avaolable via Prawn can be
used (such as background:, info:, optimize_objects, etc. - see
http://prawn.majesticseacreature.com/docs/0.11.1/Prawn/Document.html#method-c-new
)
Merge conflicts with README
Update README.md
Update Rakefile to use Gem::PackageTask
Merge branch 'master' of github.com:jordanbyron/prawn-labels
Added Avery5163
Move examples into smoke tests for easy debugging

These tests are super basic and don't actually test each feature, but
they do let us know that all of the examples run without raising any
errors and produce PDFs
Add DEBUG option to visually debug test PDFs
Update README and gemspec
More small README fixes
Hello Prawn 1.2!
Remove version from README
Mergefix
Updated margins after test prints