Libmboard manual link is dead

[svdhoog]

The readme has a dead link to an online manual:

"You can also browse the User Manual online at: http://www.softeng.cse.clrc.ac.uk/libmboard/"

[ptheywood]

The readme has been updated to point to the correct location of the online user manual as of 2a4c249

http://www.softeng.rl.ac.uk/st/projects/libmboard/