trouble with importing libraries

can any one step me through adding libraries from Github. sometimes the names of the files are not accepted due to in proper characters in title. i have seen the same error about the hex file with different libraries all of which i had to change the main folder name get it to be accepted. the one i am trying to get imported is from here https://github.com/Pansenti/MPU9150Lib/tree/master/libraries/MPU9150Lib and is for due

Make a folder with some appropriate name
in your /arduino-1.5.4/libraries/ folder.

Download the 6 files into that folder.

Restart your IDE software.

Done?
If not, what exactly happens?