Added custom outgroup specification for Trebouxia ITS

This may be something that I will need to add for the other groups, rather than
relying on midpoint rooting which has the danger of being inconsistent
added code to label clades

This is an ugly hack because I can't figure out how to move the internode labels to
the right of the figure. Instead I am modifying the SVG after rendering. The way I have
done this is hacky and brittle. It would be far, far better to use a proper XML parser to
find the relavent nodes, but that is for a future version.
first commit
updated with all Trebouxia ITS sequences available as of 6 Oct 2014
Trebouxia ITS sequences updated through 6 Oct 2014
updated the list of clades that are considered for associations
removed a couple of print statements used for debugging purposes
added command to update clade info in the DB