Do not show 'about:*' pages in history

Fixes #198
Merge pull request #201 from siteshwar/sb-198

Do not show 'about:*' pages in history
[security] Disable SSLv3 protocol
[sailfish-browser] about:config qml implementation

Version bumped to 1.1.19
Merge pull request #203 from rojkov/sslv3

[security] Disable SSLv3 protocol
Change tabId of webpage to be notifiable
[sailfish-browser] Keep current page as active
Merge pull request #206 from rainemak/currentPageActive

Keep current page active
Merge remote-tracking branch 'origin/master' into overlay-dual-toolbar

Conflicts:
	src/dbworker.cpp
	src/pages/components/WebView.qml
Grab current page also when page is loaded

To synching two async operations, skip thumbnail update result from
database. This is ok as thumbnails are read from database when
tabmodel is initialized (assuming that writing to database never fails).
Don't save fully black thumbnail
Binding Toolbar url directly to the contentItem's url
Add placeholder (background) rectangle for the TabItem
Use BackgroundItem as a base for TabItem
Fix thumbnail scaling between portrait and landscape orientations

Keep ShaderEffectSource texture as live so that thumbnail images
are updated correctly. In addition, fillMode and anchoring removed
from the thumbnail image.
Displace and remove transitions
Fix active tab highlight
Polish TabView margins and TabItem displace/remove transitions

Both ShaderEffectSource containing activeTab or thumbnail image
is changed to frozen (non live) an item is under destruction. This
prevents texture to disappear when a thumbnail image is removed or
an active tab is destroyed.

TabView has Theme.paddingMedium margins at the beginning and
the end.
Improve thumbnail image size for portrait and landscape orientations
Cleanup warning of null assingment