Exceptions now raise correctly and changed the import of the library. Now we import exceptions from ckan.plugins.toolkit
Added tests structure
Changed because of pep8 recommendations
Show scroll if exists an resources overflow in the widget

Signed-off-by: Miguel Angel Gordian <miguel.angel@codeandomexico.org>
Widget for produce code for embedded datasets

Added  the widget views and a basic interecation  for the dataset embedded.

The file "plugin.py" was changed for add a directory "fanstatic" and
ensure a correct style including the static file in "page.html".
Merge branch 'development' of github.com:zoek1/ckanext-widgets into embeber-widget
Added the size modifiers.

Added the support for modify the size in the inputs and
the predefined sizes. The changes will reflect in the code.

TODO: Support for register the controllers for provide a higher
abstraction, the controller will have the work of generate a different
code. In this case is 'iframe'.
Fixed the button 'Visualizar'