Added instruction step for MORSE update

It is necessary to re-run cmake. Otherwise new files will not be installed into the workspace, e.g. /opt/strands.
Update README.md

I found that `sudo pip install wstool` didn't work, but using the packages by `sudo apt-get install python-wstool` was better.
added gist to automate update procuedure
Merge branch 'master' into linda-stable