Update README.md

Merge pull request bulletphysics#397 from erwincoumans/master

simple lua script test, fix relative path issue in urdf importer

Merge pull request bulletphysics#381 from erwincoumans/master

test again, for mac travis support

Merge pull request bulletphysics#369 from erwincoumans/master

use wall-time delta time for examples, fix btDbvt (disable memmove)

update version to 2.83 for an intermediate release (2014 will be a tr…

…ansition year to Bullet 3.x)

Update readme.txt

add explanation of a few new command-line parameters

fix double precision, and remove alloca

increase mass of the load, to show benefits of direct MLCP solver
move damping back to original location