Remove bullet collision detector. This work will be in bullet_collision_detector branch
Update before_install.sh

Remove bullet dependency
Add _isOffsetLocal parameter specifying the reference frame for getWorldAcceleration(), getWorldJacobian(), and getWorldJacobianTimeDeriv().
Change order of operators for better performance
Fixed the bug in self-collision for Lemke
Clean up FreeJoint.cpp
Fix link error in Ubuntu Saucy
Rollback replacing tabs to spaces
Merge pull request #129 from dartsim/gtest_pthread

Fix link error in Ubuntu Saucy
Installing 3rd-party library packages from ppa instead of building the sources directly
Fix bug in BodyNode::getWorldAcceleration()
Merge pull request #130 from dartsim/3rd_party

Installing 3rd-party library packages from ppa instead of building the sources directly
Fix style of constraint namespace
Fix typo: Geoorgia -> Georgia
Fix style in copyright
Fix incorrect condition expression of for-loop in BodyNode::init
Fix bug in BodyNode::updateBiasForce()
- Joint damping force wasn't added in forward dynamics.
Re-add feature for rendering scaled meshes
- This commit manually apply ca605c8dba1e3f8b976a7df68688afc498afc2de to the current master head. Parent of ca605c8dba1e3f8b976a7df68688afc498afc2de is of also master branch, f359e57, but it is too old to merge back to the current head.
- Thanks to @tobiaskunz
Merge pull request #132 from dartsim/scaled_mesh_master

Re-add feature for rendering scaled meshes
Fix bug in ConstraintDynamics::updateConstraintTerms()
- Add missing force, joint daming force, to calculate mTauHat