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
Add explicit time axis for beta diversity plots

The function create_personal_mapping_file was modified to add the SiteID
column in the mapping file.
Test module was updated accordingly.
Merge pull request #54 from jrrideout/master

Fixed broken unit tests.
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
Merge pull request #53 from ElDeveloper/issue_22_a

Add explicit time axis for beta diversity plots
Added more error checking and unit tests.

Error checking and unit tests added for create_personal_mapping_file() and create_personal_results().
Added another create_personal_results() test.

Test for suppressing all output types.
Added test for invalid time series category.
Added partial support for testing print-only mode.
Finished test for print-only mode.
Merge pull request #57 from jrrideout/more_unit_tests

More unit tests.
single_rarefaction.py is now run only once.
Merge branch 'master' into issue_55
Merge pull request #58 from jrrideout/issue_55

single_rarefaction.py is now run only once.
Rarefied OTU table is now split only once.

Split once instead of on a per-individual basis (improves runtime).