add 'fixed' joint for btMultiBody
improve btMultiBody version of URDF reader (still work-in-progress)
enabled planar joint for btMultiBody (untested)
enable loading from relative path for .stl meshes
fix compile issue
fix two compile errors, thanks to Travis
https://travis-ci.org/bulletphysics/bullet3/jobs/33858712
more bug fixes
Merge pull request #223 from erwincoumans/master

add 'fixed' joint for btMultiBody
Create appveyor.yml

test script for appveyor
Update appveyor.yml
Update appveyor.yml
Update appveyor.yml
Update appveyor.yml

aargh, a few more examples how to use simple cmd use would help, please appveyor
Update appveyor.yml

aaargh, trial-and-error appveyor scripting
Update readme.txt

attempt to get travis results in readme