ERR: Error message for beta_significance.py now includes relative abundance as a potential cause
ENH: changed shutils.copy -> copyfile to prevent permission bits from being replicated and causing a failure
DOC: added changelog note
Merge pull request #1784 from ebolyen/issue-1355

ERR: Error message for beta_significance.py now includes relative abundance
Merge pull request #1785 from ebolyen/issue-1382

ENH: changed shutils.copy -> copyfile to prevent permission bits from being copied causing a failure.
Merge branch 'master' into issue-1475

Conflicts:
	ChangeLog.md