make spectrum.calibrate() permanent by default

[jywarren]

This could be a 'breaking change' -- let's put it off for now. But calibrate needs a temporary version in:

src/api/SpectralWorkbench.API.Core.js
src/api/SpectralWorkbench.API.Operations.js

which could be spectrum.getCalibrated() perhaps, and then spectrum.calibrate would become permanent (and include the spectrum.load() call as shown in the README example.

[acharyasourav]

Hey, I'm new to opensource and would like to contribute to this. This seems good enough for me to start. Can someone elaborate and help me on what needs to be done. Thanks.

[jywarren]

Hi @Sugarlust, we'd love your help but this is a pretty obscure one. Would you like to try looking on https://code.publiclab.org/#r=all for more, or requesting one in our chatroom? https://gitter.im/publiclab/publiclab