Updated PojoToProtoSerialisationServiceImpl.java to fix issue where generated .proto files would have unnecessary "_" for types of sfixed32 and sfixed64.

Issue was on line 237 ".getProtoType().name()".  This would just return the name of the enum from ProtoRuntimeType.java (which is auto generated) when in reality we need the value. Changed it to  ".getProtoType().value()"
patch protomak so that it works for me.
relaxed min/max constraints.
create a default package name of 'foo'.
Merge branch 'master' of https://github.com/chester8mcgee/protomak