Removed debug message
Change name of visualizer target to simbody-visualizer.
Create .gitignore, and ignore debian output.
Change GUI_NAME, etc. to  simbody-visualizer.

With only these changes, the examples fail to realize that the
VisualizerGUI executable has been renamed. This commit thus breaks the
invocation of simbody-visualizer by other executables.
Rename files and folders named VisualizerGUI.
Appropriately edit occurences of 'VisualizerGUI'.

The text 'VisualizerGUI' appears in no text files now. The only place it
exists is in the *.doc files. I don't want to edit those, because I
don't have Microsoft Word. I didn't do a simple find-replace from
VisualizerGUI to simbody-visualizer. In Doxygen documentation, I mostly
converted VisualizerGUI to visualizer. In Exception messages, I
converted to simbody-visualizer.
Formatting.
Fixes #10.
Add a test for the new Optimizer::getAlgorithm() method.
Update description in debian packages.

Description referred to an image of Isaac Newton that is present in the
Doxygen. A user seeing the description wouldn't know what is being
referred to.
Fix stage dependency documentation -- the MInverse operator doesn't
require Stage::Dynamics now (just Stage::Position) so users of it aren't
Dynamics dependent.
Fix copyright & author.
Correct typo for 'files' file; add comment.
Call make doxygen
Added support for DecorativeMeshFile as a subclass of DecorativeGeometry to pass meshes to Visualizer by file name.
Correct typos in IpOpt header guards.
Clang does not recognize some optimization flags.

Namely, -fno-tree-vrp and -fno-guess-branch-possibility.
Improve how we check what the compiler is.

Using the check shown at
http://stackoverflow.com/questions/10046114/in-cmake-how-can-i-test-if-the-compiler-is-clang.
Fix #66: add += operator to VectorIterator class

It seems that the templated std::sort with clang on OS X 10.9
requires iterators to have a += operator defined. Adding the
operator fixes the broken build.
Fix #66: add -= operator and fix assert

Fix the assert statement per recommendation by @sherm1 and
add -= operator.