Man page for mpileup
sambamba mpileup: edited man page
man: sambamba-pileup man page
mpileup: when --bcftools was not passed in mpileup would stop on error, rather than
         not call bcftools.
mpileup: disable stderr output for every invoked samtools (we might add a --debug switch instead)
mpileup: -o switch was ignored
Merge pull request #104 from pjotrp/master

mpileup