Add MSSQL Support

I have been able to get mssql to work with rundeck after a few minor code changes. I've tested with the internal H2 DB, MSSQL2012, and Mysql 5.6.15 in a test instance using the war file and tomcat/jdk7. For MSSQL I used the microsoft JDBC driver and for Mysql I used the bundled driver. I couldn't test against oracle however; these changes use hibernate to choose the sql type rather than a hard coded one which should work properly with oracle. 
Yes, otherwise this would default to longblob, which do not exist in mssql or oracle. This was the easy workaround I could find to fix it, by setting the maxSize the grail/hibernate would then choose the correct sql type for each database I was able to test (mssql, mysql, and hibernate) . Since this is the maxSize it could be set to an arbitrarily large value to choose a large data type. The issue is that there doesn't appear to be an sql datatype that could be hard coded here to work with the major databases.