[Bookmark] Add stubs for extension native code

Note that we had to depend on evas since favorites.h from
capi-web-favorites does include Evas.h, and its pc file doesn't
explicitly include evas.

EvasObject type is used for manipulating the favicons.
[Bookmark] Implement JS API on top of a fake provider

This patch adds a complete JS API, including all the error handling
covered by TCT tests. The public API is implemented in terms of a
BookmarkProvider object.

At the moment there's a FakeBookmarkProvider implemented, that stores
all the data in JavaScript. This was used to bootstrap the JS API and
implement the error handling. As the name implies, it doesn't actually
store the bookmarks in the real database.

Next step is to replace 'FakeBookmarkProvider' with a real provider
object that communicates with the native side of the extension.
Merge pull request #186 from cmarcelo/bookmark

[Bookmark] Add JS bits of bookmark