Experimental partial resampling
Rescale between two points, minor changes to the resample method varaiable assignment
Resampling of waveform data
changes to core.js
Changed core.js and waveform-data.min to be updated with new code
Fragmenting tests to prepare the new resample method ones.
More efficient test tooling.

- up to date `karma-mocha`
- `npm run test-watch` to quickly watch and test over a single browser
- watch the source code files as well
Merge pull request #6 from bbcrd/feature-6

Generate partial resampled data