bug fixed version
* improved the output file in ``ssgsea``:
- samples.raw.es.txt: enrichment score for all samples
- samples.normalized.es.txt: normalized enrichment score (nes) for all samples
- subfolders of each sample: nes, fdr, p-values are calculated by original GSEA method.
- **note**: enrichment plot only shows es
* ssgsea: scaled ES, add ``sample_norm_type`` argument to specify rank method. 36, rank method including:
- rank
- log_rank
- log
how these methods rank genes, see [ssGSEAprojection](http://rowley.mit.edu/caw_web/ssGSEAProjection/ssGSEAProjection.Library.R) , line 86.
* improved gct file input for ssgsea, gsea
- reset_index for pandas series index after sorting values (gct input)
* enrichr: fixed bug in single column input of dataframe
* docs improvement: new links, and more examples, see http://gseapy.rtfd.io/