Version 3.2.0

Merge pull request OpenSees#171 from mhscott/elasticbeam2d

Elasticbeam2d

Merge pull request OpenSees#75 from zhuminjie/master

Add QzSimple1 API

Merge pull request OpenSees#37 from jpcoding/patch-1

corrected wrong head file

Release 2.5.0 - svn release 6236

Release 2.4.6 - svn release 6016

Release 2.4.5 - svn release 5855

Release 2.4.4 - svn release 5764

Release 2.4.3