Configure Travis to build with both JDK 7 and 8 (Oracle)
Add build status to README
Issue #9: remove import of 1998 namespace.
Issue #9: revert 998d91, update maven-jaxb2-plugin

Version 0.9.0 of maven-jaxb2-plugin includes support for the
'accessExternalSchema' property, which is false by default (tighter
security). Preference here is to preserve MS's original schema and
configure our build tool to work with it.
Merge pull request #8 from nblair/travis-jdk-config

Configure Travis to build with both JDK 7 and 8 (Oracle)