Ont-fast5-api

Removed
- python2 compatibility
Fixed
- minor documentation errors: https://github.com/nanoporetech/ont_fast5_api/issues/28

Added
- Script to check the compression type of fast5 files in a folder
- `compress_fast5` can now be used `--in_place`
Fixed
- Reading arrays with padded strings now succeeds (on h5py>2.7)
- Compatibility bugs with h5py==2.6 now raises appropriate errors
- Fast5File now has attribute read_id to match documentation
Changed
- Now use standard settings for gzip compression (gzip=1, shuffle=None)
- Inverted dependency between `Fast5File` and `Fast5Read` so `Fast5Read` is now the primary object

Added
- Option to `--ignore_symlinks` in fast5 conversion scripts
- Explicit check to file_type for detemining single/multi-read files
Fixed
- `fast5_subset` with single read fast5s was failing
- unit test data now cleaned up properly

Added
- Compatibility for VBZ compressed reads
- `compress_fast5` script for compressing/decompressing fast5 files
- `get_reads()` helper method to more easily loop through reads in a fast5 file
Changed
- `Fast5File().get_raw_data()` updated interface to match `Fast5Read` and remove support for legacy files with multiple read numbers in a single `Fast5File`
- Minimum depedency version requirements bumped. Set to Ubuntu16 `apt` python3-package defaults
Removed
- Legacy `Fast5Writer` object. `MultiReadFast5` or `EmptyFast5File` are preferred

Added
- Check for progressbar2 package and fail early if it's installed.

Added
- Support for h5py==2.10 string data type encoding changes
Fixed
- Corrected some "for for" typos in argparse help text.