Scope: Release of v0.7.1

Minor release, mainly to bring documentation and samples
up to date with current state of code, and to start the final
refactor of the servlet implementation. Servlet docs still lacking
until that subsystem stabilises.

* Lots of work on documentation.
* Refactor of org.scopemvc.view.servlet package.
* Tidy up servlet sample for future addition of more sample web applications.
* Tidy up of new StringConvertors.
* Added a couple of unit tests for new StringConvertors.