cannot make dashboard - missing commands

[noelmcloughlin]

make fails

          ID: opensds dashboard repo build from source
    Function: cmd.run
        Name: make
      Result: False
     Comment: Command "make" run
     Started: 13:34:32.669826
    Duration: 21.219 ms
     Changes:   
              ----------
              pid:
                  29581
              retcode:
                  2
              stderr:
                  ./image_builder.sh: line 21: npm: command not found
                  ./image_builder.sh: line 22: npm: command not found
                  ./image_builder.sh: line 23: ng: command not found
                  cp: cannot stat './dist/*': No such file or directory
                  make: *** [dashboard] Error 1
              stdout:
                  chmod +x ./image_builder.sh \
                    && ./image_builder.sh
                  Makefile:25: recipe for target 'dashboard' failed

[noelmcloughlin]

fixed by #34