fixed const iterator errors (win64)
Fix degenerated rotation axis bug when normal is parallel to x axis.
Remove the redundant scene_search_tree_.
Add graph segmentation using random walks

This is an implementation of the algorithm described in "Random Walks
for Image Segmentation" by Leo Grady which works with BGL graphs.
Add unit tests for random walker segmentation
Add ${EIGEN_VERSION} to FindEigen.cmake
Add guards to check Eigen version

Random walker needs Eigen::Sparse module, which is available since
version 3.1.0.
Add custom PPA to get latest Eigen for Travis
Updated documentation of point picking event for indexing- issue #266
Fixed tabs to spaces
Add: ability to load/save file according to extension
Update: Can load a TextureMesh from an OBJ file
Update: enable file load/save
Fix: indentation
Merge pull request #414 from nizar-sallem/file_save_load

File save load
Fix "no member named 'at'" error in clang 3.5.0
Merge pull request #413 from jpapon/point_picker_doc

Updated documentation of point picking event for indexing
Merge pull request #407 from taketwo/master

Add graph segmentation using random walks
fix compilation of 3d_rec_framework after metslib change
Add missing include in 'search/kdtree.h'

Without this include compilation with `PCL_NO_PRECOMPILE=ON` fails.