NPM Start Scripts are not cross platform compatible for dev

[quadrophobiac]

Commands in https://github.com/theodi/comma-chameleon/blob/master/package.json#L6-L11 do not execute. Seems like elements of this may be known issues (such as ampersands). Other causes may be down to correctly configuring path for node.
This can be worked around as each of the scripts contained in package.json will execute if the commands are executed. However that requires global install of node modules electron-mocha and gulp-cli.
Suggest amendments to the README as an interim solution but would seek something more satisfactory in longer term