[maven-release-plugin] prepare for next development iteration
Addressing Checkstyle violations
JCLOUDS-656: Parse Swift authentication headers case-insensitively

Also ensure they are added to the result object with the normalized
capitalization expected by downstream code.

Follow-up to 375cb207.
JCLOUDS-650: ContainerNotFoundException on putBlob

Found with Ceph s3-tests and s3proxy.
JCLOUDS-496: Use the security groups options in the portable TemplateOptions
JCLOUDS-662: Support multiple disks with the same size using SoftLayerTemplateOptions
JCLOUDS-661: Adding a test for single-port firewall rules
JCLOUDS-676: Fix reflection warnings / Clojure

JCLOUDS-676: Fix reflection warnings / Clojure

Also fixed a typo in a doc string
fix ASF copyright headers on SoftLayer
Backport https://github.com/jclouds/jclouds/pull/472
JCLOUDS-679: Use HEAD for S3 bucketExists

This method costs 0.4 cents per 10,000 requests instead of 0.5 cents
per 1,000 requests:

http://aws.amazon.com/s3/pricing/

API reference:

http://docs.aws.amazon.com/AmazonS3/latest/API/RESTBucketHEAD.html
Throw ContainerNotFoundException from removeBlob

This makes removeBlob consistent with all other user-facing methods.
Set Content-MD5 only if ETag has correct format

Previously this check was more lenient than it should have been.
Improve XML compatibility with trace-level logging

Some providers, notably Azure, include a byte-order mark in their XML
responses.  ParseSax.apply buffers these responses in a String when
users enable trace-level logging to include the response in any thrown
exceptions.  InputSource(InputStream) skips these byte-order marks
while InputSource(Reader) does not, yielding a SAXParseException.
JCLOUDS-296: Deprecate Rackspace First-Gen CloudServers
Added assertion for versioned OpenStack extension APIs. Required for the Neutron v2 API.
JCLOUDS-296: Deprecate Rackspace First-Gen CloudServers
JCLOUDS-686: Remove changesSince() query from base PaginationOptions
Add assertj-core and assertj-guava dependencies to project pom
JCLOUDS-514: Support attaching volumes at boot in Nova