Add respond_to to controller so it doesn't throw 406

Fixes #9

When the PDF file gets requested, the Accept header specifies PDF, but the
controller didn't have that as a response type, so it would throw a 406 not
acceptable to the client.  This patch registers PDF as a response type for
the controller.
Remove :extra_note hook from _bye

Fixes #8

According to the 1.1.0 release notes, hook is deprecated. Since
I'm not aware of how to replicate the functionality with Deface,
I'm suggesting removing the feature so the extension works
without throwing an error, at least until someone can replicate
the functionality.
Update invoice to include options from spree_flexi_variants

The spree_flexi_variants extension makes new ad_hoc option types
which aren't in the variant.  This patch allows the invoice to show
all of the options, including the ad_hoc ones.
Merge pull request #14 from lilleyt/master

Note removal of :extra_note in README
Display buttons within button bars not after.
Merge branch 'pdf' of https://github.com/lilleyt/spree_print_invoice
make compatibel with spring 1.2
Update Versionfile.
Spanish locale
Typo
Fix Configurations feature 5.Enable packaging slips to do what it suggested
Merge pull request #19 from zhiyao/master

Fix Configuration Feature 5. Enable Packaging Slip to do what it suggested.
Merge pull request #18 from eltercero/master

Translation to Spanish
Bump version
Update for Spree 1.3
Fix issue with toolbar breaking on non-order pages
Fix Config reference
Check for pre-existing pdf mime type (fixes #24).
Merge pull request #25 from linrock/fix-mime-type-warning

Check for pre-existing pdf mime type (fixes #24).
Merge pull request #22 from binaryphile/1-3-stable

1 3 stable