Add smlnj, python-qt4, python-qt4-dev

- Remove 4 lines of stray whitespace from end of common file

- Per alexp: (Trac: #1457)
  - Add smlnj (on Trusty only; not present in Precise)
  - Add python-qt4 and python-qt4-dev
Add trimage (Trac: #1513)

Per request, add trimage to thirdparty
Add python-virtualenv (Trac: #1422) and release

-Per request, add python-virtualenv
-Release 1.2.5