Improved logging, progressbars and bugfixes

Quality of life

• uuparser is now a proper Python package and has Pypi releases, for a much easier installation
• Logging now uses loguru under the hood instead of bare prints, which helps if you want to use it as a library
• We now have 🌟 progressbars 🌟 instead of filling your console with text progress reports

Potentially breaking

• We now enforce 0 as our default for --dynet-seed, instead of relying on DyNet to set it, which means that your results might change if you used to leave the option out

Fixed

• #25 was preventing training continuation using pickled parameters, this is now fixed