added background coloring of cells in OTU category significance tables
Merge branch 'master' into issue-50

Conflicts:
	my_microbes/format.py
generalized code to use individual_titles variable

previous this was hard-coded for "Self" and "Other"
added comments
Merge branch 'master' into issue-50
fixed unit test that broke as a result of previous merge
Merge pull request #52 from gregcaporaso/issue-50

fix for issue 50