Exculude nodes/*.json from the git management.

This commit refs #165.
Add generic sample node json file.

This commit refs/fixes #165.
Merge branch 'id/165' into dev
Delete the 3rd party cookbooks.

This commit refs #164.
Add Berksfile to manage 3rd party cookbooks.

This commit refs #164.
Exclude the following file/directory from git management.

  * Berksfile.lock
  * cookbooks

This commit refs #164.
Add explanation on how to install Berkshelf.

This commit refs #164.
Add explanation on how to install 3rd party cookbooks.

This commit refs #164.
Modify Rakefile to test properly.

This commit fixes #164.
Merge branch 'id/164' into dev