[sailfish-browser] Notify memory pressure

Requires: https://github.com/tmeshkova/qtmozembed/pull/76
Update qtmozembed requires field
Merge pull request #140 from rainemak/memoryPressure

[sailfish-browser] Notify memory pressure
[sailfish-browser] bookmark editing

use enterkey to accept/jump, don't allow empty urls, show url instead of empty title

make landscape scrollable, inputhints for url field
Merge pull request #138 from veskuh/edit-bookmarks

[sailfish-browser] bookmark editing
[sailfish-browser] Enable usage of stored basic auth credentials