Fix most warnings generated from -Wmost, for SimTKcommon.
Fix travis syntax error.
Fix clang SimTKcommon warnings; use -Wall in travis.
Remove pragma to avoid MSVC bug.
Define time conversion when using MSVC.
Fix TestPlugin test failure; updating cwd.
Fix Wstrict-aliasing in String.
Ignore -Wmaybe-uninitialized in rpoly.
Clean up GCC pragmas in rpoly.
Hide GCC pragmas when using clang.
Fix Pathname GCC/Clang warning.
rpoly GCC warning is gcc-version-dependent.
Fix silly preprocessor typo.
Undefine a temporary preproc. def.
Turn off Wall, turn on Werror.
Merge pull request #192 from chrisdembia/fix-Wmost-warnings

[WIP] Fix most warnings generated from -Wmost, for SimTKcommon.