Adds feature and steps for testing uploading a feed with Usage Summaries
Fixes typo in integration feature
Adds Electric Power Usage Summary unmarshalling test and hibernate annotations.
Adds Electic Power Usage Summary to builder and tests
Adds Electric Power Usage Summary to persistence Integration feature test
Adds Electric Power Usage Summary table to the Usage Points page.
Refactors the import and retail customer features to remove redundant coverage and share verification steps
Merge pull request #7 from energyos/import-usage-summary

Import usage summary