BUG: working on a fix for #487.
DOC: clarifying remap_ids
ENH new .travis.yml
ENH travis.txt
comparing higher_order_sp as a replacement for implementation of higher_order
ENH new kw args for higher_order_sp.
Merge branch 'master' of github.com:pysal/pysal into 487

Conflicts:
	.travis.yml
Update .travis.yml
Merge pull request #490 from sjsrey/487

Fix for #487
Merge pull request #494 from pastephens/master

Enables testing against two versions of SciPy shipped with the last two Ubuntu LTS versions.
ENH Deprecation warning for regime_regime weights #486
ENH fixing doctest for regime_weights deprecation warning
Merge pull request #497 from sjsrey/486

ENH Deprecation warning for regime_weights #486
renamed nat_queen.gal for #452
Merge pull request #499 from sjsrey/452

renamed nat_queen.gal for #452
ENH Faster higher order operations
ENH handle islands in new higher_order
ENH opt for higher_order
Merge pull request #500 from sjsrey/higher_order

More efficient higher order operations
ENH Prototype of grid for links to notebooks on landing page