hwhw/kindlepdfviewer — pull request #124 by houqp (2012-04-18 09:10:51+00:00)
Title: rewrite jump stack and add bookmark feature

* jump stack is rewritten as jump history
* show jump history `Shift`+`B`
* go backward in history `Back`
* go forward in history `Shift`+`Back`

* add bookmark feature
* show bookmarks `B`
* add current page to bookmarks `Alt`+`B`

#### Notes about jump history:

Now we can keep going backward in history by press `Back` key. Vice versa with `Shift`+`Back`.

When we do a real jump (not regular page turn), the forward history will be cleaned up and a new head in history will be set.

Comments are welcome for the new implementation :)