Update README.rst
Merge pull request #12 from TUW-GEO/develop

Develop
added openlayers source
first web commit
ancilliary javascript files
update web interface
bugfixes in web interface
updated web interface
updated web interface
updated poets dataviewer
updated poets web interface
added poets logo
added data viewer for time series
updated time-series viewer
added option to download time series
added option to calculate anomalies
renamed app template
added docstrings
updated legend for image overlays
images are now written into StringIO
updated legend function