Add Enum support: define the String and Int ADMESerializers

and rename unknownEnumName annotation parameter to fallbackEnumName.
Inprove javadoc for Serializers
Add ADMESerializers for BigDecimal and Currency classes

this are not defined as basic JavaType, they are more like examples on
how to define custom ADMESerializer.
Utility methods for defining a SQLiteContentProvider

a base SQLiteContentProvider, extracted from the source code of various
open source Android software and a class to more easily define your
ContentProvider Uris and construct your UriMatcher.