Patch to include switch for island warning as proposed in #295. The method  is modified as well to include the switch
Bump.
Matching travis results reg. precision issues.
Merge pull request #307 from pedrovma/spreg_integration_1.6

Spreg integration 1.6 - matching test results
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Merge pull request #308 from pedrovma/test_fixing

Test fixing...
silent_island_warning implemented for w_clip
silent_island_warning implemented for w_symmetric_difference. Previous commit included support of silent_island_warning for WSP2W as well
silent_island_warning implemented for w_difference
silent_island_warning implemented for w_intersection
Update README.md
silent_island_warning implemented for w_union
Merge branch 'master' of github.com:pysal/pysal into changelog_1.6