Create run_analysis.R

#==================================================================
#  Coursera: Getting and Cleaning Data
#  Assignment by Julien Delvat
#  Created: April 27, 2014
#  Source File: https://d396qusza40orc.cloudfront.net/getdata%2Fprojectfiles%2FUCI%20HAR%20Dataset.zip 
#               Unzip direcly in same folder as current script
#==================================================================