Removed 'required' attribute from Property class and related usages.  This property was not being used, so it should be removed to eliminate confusion.
Removed Iterable<Account> from Group's interface declaration - this could cause confusion due to ambiguity in the future if we support nested groups.
Merge pull request #9 from stormpath/dev

Java SDK API Enhancements
fixed erroneous @since annotation
Updated copyright
Updated copyright
[maven-release-plugin] prepare release stormpath-sdk-root-0.8.0
[maven-release-plugin] prepare for next development iteration
Picked up latest changes from dev branch.  Fixed merge conflicts reflecting latest 0.8.0 api
Picked up latest changes from dev branch.  Fixed merge conflicts reflecting latest 0.8.0 api