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Make Repository#search handle 401 errors gracefully

Any digital object which generates a 401 error is silently skipped.
Merge pull request #20 from dbrower/alter-search

Make Repository#search handle 401 errors gracefully
Expose methods relating to controlGroup
Validate that you have provided a pid when calling export()
Merge pull request #21 from projecthydra/expose_datastream_methods

Expose methods relating to controlGroup
Merge pull request #22 from projecthydra/validate_args_to_export

Validate that you have provided a pid when calling export()
Bump version to 1.6.2
Add history to 1.6.2
Remove jetty as a submodule
Add to travis
Make the default rake task run the ci build
Added Travis CI badge to readme
Remove backports dependency. Fixes #24
Bump version to 1.6.3
separate API endpoints for ingest and minting a new pid and ingesting
move describe into the api client and url hlpers
isolate rest client from the url helper
split list-datastreams and get-datastream-profile into separate RestApiClient actions
isolate the rest api client spec from the underlying rest endpoints