JCLOUDS-458: Addressing suggestions in PR-31

minor changes

minor changes

minor changes

minor changes

Added ErrorHandler with tests

Changed BucketApi method descriptions

Minor change in error handler
Up to 2.0.0-SNAPSHOT after the 1.8.0 release
Updating project and jclouds.version to 2.0.0-SNAPSHOT
JCLOUDS-653: Address Guava 18 deprecations

Mostly renaming Objects.toStringHelper to MoreObjects.toStringHelper.
Remove maven-license-plugin

This never seemed to work and we will enforce license text via
Checkstyle instead.
JCLOUDS-643: Fix Google and OAuth tests
JCLOUDS-633: Support passing bearer token directly for OAuth2