Update .gitignore
Add LocalityHints support

  * Add method FenixFramework.getOwnerDomainObject(String)
  * Remove Infinispan's specific OID (use generic OID from core, which is the same)
  * Add support for LocalityHints in the OID
  * Add LocalityHints in all DomainObject hierarchy (includes code generation)
Add method to list storage keys used for a DomainObject

    * Add method FenixFramework.getStorageKeys(DomainObject)
    * Missing implementation for backend OGM (requires support from Hibernate
      OGM)
Add method to obtain object that owns the given storage key
Merge branch 'feature/cloudtm-locality-hints' into cloudtm

  * Add constructor to all DomainObjects taking LocalityHints
  * Add method to obtain object that owns the given storage key
  * Add method to list storage keys used for a DomainObject