Merge pull request #51 from MartijnRas/master

"Fixed issue #50, made Facebook and Google+ buttons optional through the settings"

On line 343, there is the default _settings definition.
You should add the Google and Facebook options to it, as well, so the options will be set to true by default.
Just doing it to the PPW object(as you did, on the returned object in the end of the file) will not set it as the default value.
Merge pull request #52 from MartijnRas/master

Fix for issue #50. Added the Google and Facebook options to the default _settings definition.
Added Page Up and Page Down to keyboard commands, to complete issue #41