Kipoiseq

- removed some dependencies (hdf5 and related )
- inital api for vcf_seq_extractor added
- minor changes related to circleci
- usage of kipoi_conda and kioi_utils packages

Features

- added `vcf_seq` extractors https://github.com/kipoi/kipoiseq/pull/23
- `SingleSeqVCFSeqExtractor`
- `SingleVariantVCFSeqExtractor`
- `VariantSeqExtractor`

Refactoring

- kipoiseq now uses `kipoi-utils` and `kipoi-conda` https://github.com/kipoi/kipoiseq/pull/22

Refactoring

- rename `IntervalSeqDl` -> `SeqIntervalDl` and `IntervalSeqStringDl` -> `StringSeqIntervalDl`

Refactoring

- Rename dataloaders:
- closes https://github.com/kipoi/kipoiseq/issues/13
- `datasets.py` -> `dataloaders.py`
- `SeqDataset` -> `IntervalSeqDl`
- `SpliceDataset` -> `MMSpliceDl`
- remove `use_strand`

New features
- `MMSpliceDl` - MMSplice dataloader
- add `get_output_shape`
- Allow to use genomelake's `one_hot_encoding` when genomelake is installed