Add LASTools to QGIS 2.6.0

1. Copy LASTools from http://lastools.org/download/lastools.zip
2. Extract the LASTools folder to a directory without space in the path, e.g.: d:\download





3. Start QGIS and open the Processing Toolbox (Processing-->Toolbox)
http://docs.qgis.org/2.0/en/docs/user_manual/processing/toolbox.html

4. Change to Advanced interface in the Processing Toolbox.

5. Open Options (Processing-->Options...)
6. Under Tools for LiDAR data: Click the Activate checkbox and fill in the path to your unzipped LASTools directory:

The Tools for LiDAR data is now shown in the toolbox:

When I tried this I first got this error message:
global name 'os' is not defined See log for more details
How to solve this problem is written here:
http://osgeo-org.1560.x6.nabble.com/Problems-running-LAStools-in-2-6-1-td5179484.html
1. Search for the LAStoolsUtils.py file and open it

2. Add the line 
import os 
to the code just under the line
import subprocess