DARTConfig.cmake.in: fix #79

Fix #79 by exporting @CMAKE_INSTALL_PREFIX@/include in
DART_INCLUDE_DIRS
Merge pull request #80 from dartsim/issue_79

DARTConfig.cmake.in: fix #79
Fix segmentation fault in drawRRT app
Fix #82: Linker errors

This bug was introduced in 4234340323b55fcc90137e3d8292426b7a6e834a
Update .travis.yml

Let's include release branch (dart_3.0).
Move flann include out of header file. Reduce flann to a build dependency.

Flann is no longer required for using DART, instead it is only required for building it.
Merge branch 'master' of github.com:dartsim/dart
Fix compiler error caused by last commit
Update .travis.yml
Update .travis.yml
Adapt Cmake files for FLANN only being a build dependency
Set version to 2.6
Add DARTCollisionDetector. "cubes" uses it.
Merge branch 'release-2.6_jsl'

Conflicts:
	apps/drawRRT/drawRRT.cpp
Merge branch 'origin/CS7496'