Add pictures to hydraulic module assembly instructions & fill in TODOs

[dbenamy]

http://opensourceecology.dozuki.com/Guide/Installing+Module+-+Backhoe+Hydraulics/80/3

[dbenamy]

Rob's got stills or video for steps 5 - 9. Rob- do you want to add those yourself or put them somewhere where I can add them?

We'll need to demonstrate and take new pictures for steps 2 - 4 and 10.