Add link to dev docs for TaskFlow

Since taskflow is now part of oslo, we need a link to its developer
documentation from projects page.

Closes-bug: #1279951
Change-Id: Ie0facd50e4f5fe178ece850bd05557c3eaf63988
Configuration options for the HP MSA array

Describe how cinder must be configured to use the new HP MSA Fiber Channel
driver.

Change-Id: I8e7a4fea5ee81b593f06038fd134f8d5db5ba704
Closes-Bug: #1283349
Merge "Configuration options for the HP MSA array"
Merge "Add link to dev docs for TaskFlow"