Read Skeleton from skel file
Update Migration.md
Merge pull request #168 from dartsim/issue122

Fix incorrect integration of BallJoint and FreeJoint using modified integration API
SoftSkelParser: Read Euler and universal joints and <mobile> tag
Revert unintended change on soft Cubes app
Update FindNLOPT.cmake
Initialize skeleton after it is read from skel file
Parse marker
Add Marker::getWorldPosition()
Add self collision check option for adjacent body nodes
Remove debug code
Merge pull request #173 from dartsim/self_collision_check_option

Add self collision check option for adjacent body nodes
Merge pull request #171 from dartsim/parse_markers

Parse marker
Add Marker::getBodyNode()
Merge branch 'origin/master'

Conflicts:
	Migration.md
Merge pull request #169 from dartsim/read_skeleton

Read Skeleton from skel file
Fix bullet linking using pkg-config and BULLET_CFLAGS

This adds a step to search for bullet using pkg-config on
UNIX systems. This is necessary to identify the CFLAGS
which are not provided by the FindBullet module.
The CFLAGS are needed to distinguish between single and
double precision sizes of btScalar.
Merge pull request #176 from scpeters/bullet_pkg_config

Fix bullet linking using pkg-config and BULLET_CFLAGS
Add Bullet collision detector installation for CI
Install libbuleet-dev for Travis-CI