Merge pull request #37 from uf0/master

stream fix
test d3 streamgraph with real content.
metrics.py modified IMPORTCSV with status.
api.py debugged / simplified export / import csv. Tcsv import /export tested with OpenOffice under Windows
streamgraph with order by
api.py: d3 streamgraph modifications
Installation documentation added (README file)
Installation documentation added (README file)
Update README.md
Update README.md
settings.py
Merge branch 'master' of https://github.com/densitydesign/sven

Conflicts:
	README.md
	settings.py.SAMPLE
Merge branch 'master' of https://github.com/densitydesign/sven

Conflicts:
	README.md
	settings.py.SAMPLE
Merge branch 'master' of https://github.com/densitydesign/sven
sample file added for settings.py
gitignore added into media dir
Update README.md
streamkey fixed