[travis] Build visualizer.
Silence OSX glut deprecation warning.

This will allow fewer warnings to be emitted for OSX users. The warning has
already served its purpose (since the developers are now aware of the
deprecation).
[contrib] Describe how to untabify.
Merge pull request #306 from chrisdembia/travis-build-visualizer

[travis] Build visualizer.
[readme] Remove comment telling users not test.
[readme] Clarify release vs debug
Merge pull request #309 from chrisdembia/readme-build-testing

[readme] Remove comment telling users not test.
[ci skip]
[contrib] Replace retab with findreplace.
[contrib] Clarify vim findreplace.
Merge pull request #308 from chrisdembia/contrib-tabs

Describe how to untabify.
[ci skip]
Shorten pragma in visualizer
Merge pull request #310 from scpeters/shorter_pragma

Shorten pragma in visualizer
Switch to "override final" rather than just "final".
Remove some outdated comments.
Merge pull request #311 from simbody/use-override-final

Switch to "override final" rather than just "final"
Enable Markdown support in Doxygen and require 1.8.6 or later.
Merge pull request #314 from simbody/enable-markdown-in-doxygen

Enable Markdown support in Doxygen and require 1.8.6 or later.
Fix some comments now that Markdown syntax works.
[ci skip]
Merge branch 'master' of https://github.com/simbody/simbody