Log Message:
Update to 1.9
Add missing DEPENDS

Upstream changes:
NetworkX 1.9
Release date: 21 June 2014

Support for Python 3.1 is dropped in this release.

Highlights
Completely rewritten maximum flow and flow-based connectivity algorithms with \ 
backwards incompatible interfaces
Community graph generators
Stoer-Wagner minimum cut algorithm
Linear-time Eulerian circuit algorithm
Linear algebra package changed to use SciPy sparse matrices
Algebraic connectivity, Fiedler vector, spectral ordering algorithms
Link prediction algorithms
Goldberg-Radzik shortest path algorithm
Semiconnected graph and tree recognition algorithms