New Feature: Amazon.com Content

Hi all,

I've just committed a fully-preferences-based Amazon.com module to
rel_2_2. There are three new system preferences:

AmazonContent
AmazonDevKey
AmazonAssocTag

To use this new feature, you'll need an Associates login:

https://associates.amazon.com/gp/flex/associates/apply-login.html

and a developer's key:

https://aws-portal.amazon.com/gp/aws/developer/registration/index.html

Once you have recieved both IDs from Amazon, and put them into the
appropriate system preferences, you can set AmazonContent to 'yes'.
At this point, you should have the following content from Amazon.com
displaying in your OPAC (NPL template only):

* Cover images
* "Read it now"
* "Search inside"
* Descriptions
* Reviews
* Ratings

To see what this will look like, please view this example record from
LibLime's OPAC:

http://opactest.liblime.com/cgi-bin/koha/opac-detail.pl?bib=21752

Note that if you don't touch these systemprefs, no Amazon.com code will
be called.

Paul/HDL, if you want to add this to default templates, please take a
peek at commits to NPL template files.