Merge branch 'displayPhysicsFPS' into 'master'

ENH: Display fps on the screen along with the render fps

See merge request !305
Status Job ID Name Coverage
  External
failed imstk-liones-linux-shared-debug

00:17:17

passed imstk-liones-linux-shared-release

00:19:58

passed imstk-marvin-windows-shared-debug+msvc2013+omni

01:08:46

passed imstk-marvin-windows-shared-release+msvc2013+omni

00:54:44

passed imstk-norkit-osx-shared-debug

00:14:26

passed imstk-norkit-osx-shared-release

00:16:03

failed imstk-marvin-windows-shared-debug+msvc2013+omni

00:38:55