switch to development version
fix #7: pep8: clean errors and some warnings
fix #9: add MatrixOperator
fix #10: add sanity check to DiagonalOperator
fix #8: add documentation

includes:
 * initial working build of documentation
 * rename root of doc for compat with pythonhosted
Merge branch 'enh/sphinxdoc' into develop
add content
fix links in README
fix link to documentation
initial commit
update manifest
update changelog for version 0.3
include tests and documentation in manifest
bump version