Can define pool size based on slim.pool.size property.
Also assign property names for slim.host, slim.flags and manually.start.test.runner.on.debug (might need a somewhat more comprehensive name)
Reformat VariableFinder
Add properties to FitNesseContext.
Looking up properties from System context is a feature of FitNesseContext now.
Move default new page content to the appropriate responder, removed from FitNesseContext.
Deal with absence of properties well in FitNesseContext
Move Theme from FitNesseContext to PageFactory.
Also handle environment variables through FitNesseContext.getProperty()
Use FitNesseContext in VariableFinder to
Update documentation.
Merge pull request #189 from amolenaar/slim-pool-size

SlimTestSystem and port management