Add new connection string parameter "time_zone", which immediately sets the connection's session time_zone when opened. Default is to use whatever the mysqld time_zone initially is set to. This is set when the underlying Driver connection is opened.
Add tests for default time_zone parameter as well.
Retarget to .net 4.5 (we shouldn't need 4.5.1 for anything, and I don't see it being used anywhere with the preprocessor constants).
Remove un-necessary Properties and Conditions/DefineConstants in csproj's.