Update requirements.txt

Merge pull request nipy#1519 from satra/rel/0.12.0-rc2

updates for 0.12.0-rc2

Merge pull request nipy#1449 from satra/rel/0.12rc1

final changes before tagging release candidate

fix: version compilation

Update .travis.yml

release 0.10.0

release 0.9.2

release 0.9.1

release 0.9

0.8 release