Pykanto

Added optional dependencies for users working with Jupyter.
These can be installed by running `pip install pykanto'[jupyter]'`
Full Changelog: https://github.com/nilomr/pykanto/compare/v0.1.7...v0.1.8

Implements 30 31

What's Changed
* bugfix/app labels by nilomr in https://github.com/nilomr/pykanto/pull/26
* e3264ca6ad8475600fb0bd149978e9008cca9fca : vocalisation file naming now uses start time in frames to ensure reproducibility if datasets are built from scratch and annotation files have changed.


**Full Changelog**: https://github.com/nilomr/pykanto/compare/v0.1.4...v0.1.5