feat(spectrogramplot): Draw a time axis at the top #79
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Draws a time axis at the top like this:
![inspectrum-time](https://cloud.githubusercontent.com/assets/452051/17432550/c4d77e00-5af7-11e6-8d15-6ea13c1ea313.png)
Does use a few C style functions. If it bothers you, I can figure out how to do this in C++...