Extend physionet LSTM example

[turambar]

• [x] add example with time columns removed (or add config options to existing example)
• [x] add example using resampled data (or add config options to existing example)
• [x] once code is ready, add to physionet branch, make a PR, and request reviews from @davekale and @tomthetrainer
• [x] @turambar: upload new data including resampled time series
• [x] run experiments without time columns to see how performance affected
• [x] run experiments with resampled time series, compare performance vs. raw time series
  • [x] @turambar: make resampled data
• [ ] target replication, a la Learning to Diagnose
• [ ] (maybe) multitask LSTM, a la Multitask Clinical Time Series

[turambar]

Put these in separate files.

[turambar]

@bpark738 check off the tasks that are done. I'm looking into resampled data. :)