REL: Releasing version 4.5.0 of Mayavi

REL: tag 4.4.4 release.

REL: tag 4.4.3 release.

REL: tag 4.4.2 release.

REL: tag 4.4.1 release.

REL: tag 4.4.0 release.

REL: Releasing version 4.3.1 of Mayavi.

REL: tag 4.3.0 release.

Merge pull request enthought#51 from prabhuramachandran/fix_qt_full_s…

…creen

BUG: Qt: fix crashing full-screen-mode.

REL: tag 4.2.0 release