Added clarifying note to ADAMVariantContext
Merge pull request #274 from laserson/var-ctx-note

Added clarifying note to `ADAMVariantContext`
Implemented HTTPRangedByteAccess.

- HTTPRangedByteAccess supports HTTP range requests for ranges of
  resources. Includes a test that executes against a few bytes of the
  test mouse chromosome on the berkeley server.
- Added a new TestTags and moved the "NetworkConnected" ones into that
- Running the "networkconnected" profile as part of the Jenkins test
Merge pull request #277 from genomebridge/http-byte-access

Implemented HTTPRangedByteAccess.
Removing ADAM format directory, and updating avro data file path and pom.xmls for bdg-formats move.