Merge pull request #41 from NeuralEnsemble/development

documentation update and updated release number
Merge pull request #47 from NeuralEnsemble/development

Development
Merge branch 'development'

* development:
  Updating to version 0.2.0
  Copying latets version of nml2 schema with minor change
  Removed extra lines
  Updating to latest NeuroML 2 schema
Merge pull request #54 from NeuralEnsemble/development

Merge to master for NeuroML v2beta3 release
Test commit
Update introduction.txt
Update introduction.txt
Update README.md
Update README.md
Update README.md
Update doc
Updates to docs
Improvements to documentation
Much tidying of examples
Final check through a number of examples