Update version number to 3.3.1.
Comply with C++11 standard, as enforced by Clang.

Update travis to build with C++11 support.

Still need to edit compiler flags in CMake files to enforce C++11. This
might mean some platforms (Ubuntu 12.10) may not be supported well
anymore. This might be okay because a new long term support release of
Ubuntu is coming out in a few months.
Attempt to update gcc to 4.8 to use C++11 flag.
Remove SimTK:: qualification for gcc++11.
Temporary travis change to build with and without c++11 flag.
On travis, only test c++11 with gcc.

Clang gives test failures with c++11. These Clang test failures only occur on travis though. I've tested c++11 with clang 3.2, 3.3 on Ubuntu and with Clang 5.0 on OSX, and all tests pass.
Create CMake option for building as c++11.
Fix bug in travis.yml.
Fix bug in travis.yml.
I am messing up bash syntax in travis.yml.
Only build c++11 with gcc.
Remove VERBOSE_MAKEFILE from travis.

Was only using it to ensure that the c++11 flag was being used.
Debugging travis build.

I was running make and ctest for clang and c++11, though that was not my
intent.
Remove accidental commands in travis.
Syntax error in travis.
In travis, remove c++ version check.

My version checks were returning misleading information. I wanted to know that
g++-4.8 and clang were being used (instead of gcc 4.6, for example). In both
checks, the version returned was not what I expected. But CMake is still using
the compilers I wanted it to use. We've just enforced this through a different
means than I use on my own machine: setting the $CXX environment variable.
Merge pull request #123 from chrisdembia/cpp11

Be compatible with c++11 standard.