Merge pull request #2 from fullcontact/eghonyan-serializable

Implemented Serializable in contact info classes
Bumped version 0.9.1 for serializable classes

Basic contact info classes added serialization ids in this version
Bumped version to 0.10.0
Added URID to request builder
Added optional URID param to http request
Implemented Serializable in ContactInfo

ContactInfo class now implements Serializable interface.