Import book from goodreads

Import a book from www.goodreads.com given a ISBN.
Added goodreads and webmock gems to the project
It imports:
* ISBN
* Title
* Authors
* Cover image
* Number of pages
* Descripton
Line is too long. [104/80]<br>Place the . on the previous line, together with the method call receiver.<br>Use the new Ruby 1.9 hash syntax.<br>Prefer double-quoted strings unless you need single quotes to avoid extra backslashes for escaping.