Update to 3.0.13 packages + changed namespace to Community.SQLite for https://github.com/MvvmCross/MvvmCross/issues/432
nuspec files
Added TimeSpan support

From
https://github.com/louy/sqlite-net/commit/ab3ec916507a3196e0fd048b292e8a0af22cb390
Fixed missing index parameter
Added support for nullable enums
Merge pull request #4 from virblue/master

Added TimeSpan support - and nullable enum