Investigate using dynamic typing to depend on versions plugin

[hvisser]

If the dependency versions plugin is loaded in other ways than through the plugin block, class path errors may occur such as reported in #97. Referencing the task by name and setting its property using setProperty apis might work in that case.

Steps to implement this

• Reference the task by name and configure the properties of the versions plugin dynamically
• Remove the compile only dependency on the versions plugin
• Check that the tests still work ;)
• Check that the scenario using an init script now works