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