Merge pull request #552 from bknueven/release-0.13.1

Create 0.13.1

Merge pull request #546 from bknueven/release-0.13

setup release 0.13

Merge pull request #362 from bknueven/release_0_12_1

Release 0.12.1

Merge pull request #360 from bknueven/release_0_12

Set up 0.12

Merge pull request #304 from DLWoodruff/repar_pyotracker

Repar pyotracker

adding some code to make it easier to avoid spurious warnings (#293)

Merge pull request #271 from Pyomo/0_12_rev0

0.11.1

Merge pull request #270 from Pyomo/release_0_11

Setting up release 0.11

Merge pull request #251 from Pyomo/release_0_10

Creating 0.10 release

Merge pull request #127 from Pyomo/release_0.9

Setting up 0.9