This resolves an exception for 'Rack::Lint::LintError: header key must be a string, was Symbol'
Merge pull request #27 from jamesbrink/fix_rack_lint_exception

Fix Rack::Lint exception
[Closes #34] Update gemfile.lock
Merge pull request #35 from jamesbrink/gem_updates

[Closes #34] Update gemfile.lock
Updated Docker container to use unicorn.
Removed USER barcoded to work around issues caused by index.docker.io builds
Bumped the required activesupport version
Merge pull request #37 from jamesbrink/gem_updates

Bumped the required activesupport version
Updated Docker container to Ubuntu 14.04 and Ruby to 2.1.2
Merge pull request #36 from jamesbrink/docker_refactor

Docker refactor
Removed support for broken symbologies GS1-128 and QR
Merge pull request #42 from jamesbrink/remove_broken_symbologies

Removed support for broken symbologies GS1-128 and QR
Added support to cach invalid data on POST
Added monkey patch for QR Code, still needs logic
Added tests for testing valid barcode data
Updated test to support supp2 and supp5
Removed test conditions for broken symbologies GS1-128 and QR
Added custom exception InvalidBarcodeData
Merge pull request #38 from jamesbrink/misc_fixes

Added support to catch invalid data on POST
Fixed broken links in README.md