Adding files to attach to Behat tests

These files are located in upload_files directory and the Behat tests rely
on them when you do the "And I attach file" step

Image1.jpg: Public domain NASA image of NZ from space
Image2.png: Mahara designer image
Image3.png: Maharabot image

Change-Id: Ic1920d7b0d84cdcd5ba045e28c685675e93f0579
Signed-off-by: Aaron Wells <aaronw@catalyst.net.nz>

test/behat/upload_files/UserCSV.csv

+username,password,email,firstname,lastname,studentid,preferredname
+Kevin,Mahara1,kevin@griffin.com,Kevin,Griffin,kevingriffin,kevin
+Jenny,Mahara1,jenny@gem.com,Jenny,Gem,Jennygem,Jen
+Dow,Mahara1,dow@bridge.com,Dow,Bridge,Dowbridge,Downy
+Bob,Mahara1,bob@bobbison.com,Bobby,Bobber,bobbybob,Bob