Fix for issue #61

Improve LinePlusBarChart documentation
Add @oz123 to contributors
Add chart extras to template and add documentation
Add missing requirements

 * So that make build target works

 setuptools is redundant in requirements

 * If you distribute a file with setuptools (pip, virtualenv and so)
   It's OK to assume setuptools is pre-existing
Merge pull request #64 from oz123/develop

Add extra parameters to graphs and missing requirements