Merge pull request #4 from bioinform/master

update website from master
Merge pull request #5 from bioinform/master

minor update
Merge branch 'master' into gh-pages
Merge branch 'master' into gh-pages
debugging
Merge branch 'master' into gh-pages
check the depth
Merge branch 'gh-pages' into debug-interval-tree
fix the rotation and height computation
Merge branch 'debug-interval-tree'