Update use of `xwidget' to match current patch.

Update github url.

ezbl-exec-path: Add some flexibility for the initial value.

Make `ezbl-inst' slots `setf'-able.

Add function `ezbl-variable-set-defaults'.

Add default values for "forward_keys" and "cookie_handler"

Add "doc" attr to "zoom_type".

Update `ezbl-command-set' for new `ezbl-variables' format.

Make `ezbl-variables' into a list of alists.

Use macro for `ezbl-inst' defstruct.

Merge branch 'spec-update'

Minor restructuring changes to match current Uzbl specs.

Reorganize variables to match source.

Add the "search_clear" command.

Remove "bind" command, as it is not handled by uzbl-core.