Upgrade scala/sbt/sbt-assembly plugin
Fix up "run" configuration to avoid prompting for main class
Include whole stack trace in error dialog (needs a scrollpane now though.)
Make username and port optional for DB parameters
Require only one of stroke or fill for marker symbolizers
Allow spaces before the SELECT keyword in subqueries
Relax some regexes and clean up some code
Add support for <= filters in Mapnik
Better error message when a mapnik version is deemed unsupported
Put explicit contact info in README
Update README.rst
Add 'le' alternative notation for '<=' operator.