Add 'attributes/customize.rb'.

This file is added to enable improved user experience when overriding
attributes. Today customers often override the complete file, which will
back-fire when OpsWorks introduces new attributes.
By moving out customer attribute changes to separate files, we make it
easier for the customer to keep track of their changes. It is also
easier for OpsWorks to improve the cookbooks.

Once agreed, all cookbooks would have a 'attributes/customize.rb'.
Introduce customize.rb in all cookbooks.
Add keep_releases attribute to opsworks_deploy.

Make it possible to define the number of releases kept. One may
specify this for all apps via "deploy_keep_releases".

  { "opsworks": { "deploy_keep_releases": 5 } }

It is also possible to specify keep_releases for some applications
only.

  { "deploy": { "myapp": { "keep_releases": 5 } } }

Requested via https://github.com/aws/opsworks-cookbooks/issues/103.
Make nginx 'proxy_read_timeout' and 'proxy_send_timeout' configurable
for Unicorn web apps.
Skip rails::configure for non-rails applications

This change prevents the rails::configure recipe from
attempting to restart non-rails applications deployed
on the same instance.

The same solution is used in the other app server configure
recipes- php::configure, opsworks_nodejs::configure and
opsworks_java::context
use the custom ganglia package versions instead of the package architecture to check if it's installed
Merge remote-tracking branch 'github/master-chef-11.4' into master-chef-11.4
Improve log message.
Changed rails::configure skip log message
Support custom log_format on nginx.

https://github.com/aws/opsworks-cookbooks/pull/81

Add guard if node structure access returns nil.
Small grammatical correction.
Merge pull request #112 from Retistic/patch-1

Small grammatical correction.
Update patch level for ruby packages
Small grammatical correction.
Improve log message.
Support custom log_format on nginx.

https://github.com/aws/opsworks-cookbooks/pull/81

Add guard if node structure access returns nil.
Update patch level for ruby packages
Merge branch 'GIT_master-chef-11.4' into master-chef-11.4
Remove existing .gitignore files from extracted archive contents.
Fix undeclared dependency on Apache cookbook in the Ganglia cookbook