Fix compiler error caused by last commit
Remove .gitignore in individual sub directories.
Rename SDFParser to SdfParser.
Add benchmark.world (sdf)
Add sdfLoader app
Initialize mass and inertia in constructor of BodyNode.
Add sample sdf files
Fix SdfParser.
Use boost::token_compress_on in boost::split().
sdfLoader app loads double_pendulum.world
Merge branch 'origin/master'
Add double_pendulum_with_base.world
sdfLoader app loads double_pendulum_with_base.world