WIP on uploads (#2)

- Add data types and fields
- Implement in both RethinkDB and SQLite
- Add uploads to backup/restore
- Add empty upload folder to project
- Add indexes to SQLite tables (#15)

src/MyWebLog.Data/MyWebLog.Data.fsproj

@@ -31,6 +31,7 @@
 		<Compile Include="SQLite\SQLitePostData.fs" />
 		<Compile Include="SQLite\SQLiteTagMapData.fs" />
 		<Compile Include="SQLite\SQLiteThemeData.fs" />
+		<Compile Include="SQLite\SQLiteUploadData.fs" />
 		<Compile Include="SQLite\SQLiteWebLogData.fs" />
 		<Compile Include="SQLite\SQLiteWebLogUserData.fs" />
 		<Compile Include="SQLiteData.fs" />