Merge pull request #282 from sjsrey/network

adding example data from geodanet
- testing on geodatnet/streets
- adding diagonal option to kernel weights in user.py
Merge pull request #285 from sjsrey/diag

- adding diagonal option to kernel weights in user.py
Merge pull request #284 from sjsrey/network

Testing wed on geodanet/streets example
Merge branch 'network' of github.com:pysal/pysal into network
Merge branch 'master' of github.com:pysal/pysal into network

-adding changes to diag for spatial weights and hac