Juicer 1.5.6 update.

* Adding in new flags -b ligation and -t threads
* Changed juicer_arrowhead, juicer_hiccups, and juicer_postprocessing to not fail immediately when bed files
not found
* Corrected scripts so bc is not required
* Proper unzipping logic in SLURM and UGER
* Will always split if chunk size sent in
* Bug fixes in terms of looking for endings in splits directory
* Exits changed to 1
* Debugging changed to better determine exactly where script failed
* Touch files added to deal with jobs killed by the cluster
* Exits changed to 1
* Warning for genomePath
* Header added to hic file containing all the information about versions of software used to create that file