Add support for serializing anonymous types
Handling `PartitionKey` and `RowKey` properties in anonymous types

NOTE: This introduces a breaking change in how reserved properties are handled
for strongly typed entities. Previously they would be ignored if you set `ShouldThrowOnReservedProperties` to false. Now we will read and use PartitionKey or RowKey properties even if they don't have the `PartitionKey` or `RowKey` attribute.
Merge pull request #77 from dontjee/SupportForAnonymousTypes

Add support for serializing anonymous types