0.5.4 RC2

changes:

- converted "API whitelist" to "protected API features" (automatic settings migration)
- notification details are not stored by default
- settings page reorganized
- audio API notifies on every call
- made audio cache url specific

new features:

- added save/load directly to/from file option
- added protection for DOMRect (getClientRects)
- added setting to control if notification details should be stored
- state of the arrow for url specific values is saved
- browser action icon gets grayed out if the page is whitelisted
- added search to options page

fixes:

- window and audio API were always blocked when using any of the "block ..." modes
- canvas content was not stored to be displayed when wanted
- hovering over toolbar icon created error in the browser console

known issues:

- if a data URL is blocked the page action button does not appear