Use SQLite3.Database.openAsync and add some comments
Use SQLite3.Database.openAsync and add some comments

Also in case of an error print out the path that was tried to open in the error.

roryok/SQLite3-WinRT,doo/SQLite3-WinRT,doo/SQLite3-WinRT,roryok/SQLite3-WinRT,roryok/SQLite3-WinRT,doo/SQLite3-WinRT,roryok/SQLite3-WinRT