Release v1.0.1.1

• Issue #566: Add snapshot / restore functionality (Elastica\Snapshot)
• Issue #563: Improve performance of Elastica/Status->getIndicesWithAlias and aliasExists on clusters with many indices- Enable goecluster-facet again as now compatible with elasticsearch 1.0 on travis
• Changes for Travis
  • Add PHP 5.6 to travis test environment
  • Run elasticsearch in the background to not have log output in travis build
  • Set memache php version as environment variable
  • Update to memcache 3.0.8 for travis