Improved exercise functions and error handling

[ajfisher]

Added some generic workshops around things like science / experimenter kit and basic mBot kits.

Also fixed a niggle I've had for a while around issues with the board resetting (eg due to power failure) and leaving the serialport in an undefined state. Now if the child process raises a failure condition (eg board time out etc) then it will surface the error to the parent process which will then:

• Send the error condition status to the front end (via the console logger) in order to raise the condition with the user.
• Finalise the termination of the child process and remove it completely (thus allowing a new child process to be created the next time Run Code is executed).
• Some runner clean up.

Updated Johnny Five to current and SocketIO to current. Other packages remain non-updated due to potential large scale issues. Blockly in particular currently has huge bugs and would require significant refactoring to work (tested).