Remove references to deleted files in MANIFEST.in
Clarify required Python versions
Suggest release date
Change version in release.py
Networkx-1.9, June 21 2014
correct minor typos in edgelist.py
Merge branch 'v1.9'

Conflicts:
	doc/source/install.rst
Merge pull request #1198 from barry/master

correct minor typos in edgelist.py
Fix misformatted example in cycles.py

Addresses #1196.