Samuel Ruiz Pérez

**This PR:** Adds the argument `--keepTags` in [alignmentSieve.py](https://github.com/deeptools/deepTools/blob/master/deeptools/alignmentSieve.py) to keep the original alignment tags in the filtered/shifted/output BAM. This can be useful to distinguish between read pairs from different secondary...

Adding peak-calling with Genrich (fix #108) and multi-mapping read analysis

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**This PR:** -------- 1. Addresses issue #108: This version of the pipeline keeps the current pipeline structure the same but adds a separate "branch" for peak-calling with [Genrich](https://github.com/jsh58/Genrich) and its...