Added Caliburn.Micro.BindableAppBar packge to project
Added appbar to MainPageView
Added Polish(Poland) language and resource file
Added buttons on MainPage
Added controls in MainPage
Added DesignData namespace
Added LoremImpusGenerator
Added DesignData to MainPage
Added empty pages (Options, AboutZoo, Sightseeing)
Added default constructor to ViewModelBase (support design time data)
Fixed unaccesible _navigation field  in ViewModelBase
Added new page's VMs to Bootstrapper
Merge pull request #16 from bukal260/windows_phone

Implement welcome screen