ENH: preliminary Conda environment file for CHPv5 process

conda_env/chpv5.yml

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+name: CHPv5
+channels:
+    - conda-forge
+    - bioconda
+    - r
+dependencies:
+    - python=2.7.13
+    - sambamba=0.6.6
+    - bedtools=2.26.0
+    - deeptools=2.5.3
+    - macs2=2.1.1.20160309
+    - r-base=3.3.2
+    - r-rcpp=0.12.8
+    - r-devtools=1.13.2
+    - r-r.utils
+    - r-optparse
+    - bioconductor-genomicranges=1.26.4
+    - bioconductor-rsamtools=1.26.1
+    # most recent version of histoneHMM 1.7 not available via Bioconda
+    # Install manually:
+    # options("unzip"="internal")
+    # devtools::install_github("matthiasheinig/histoneHMM")