added plot_timeseries
1.7.24 Support for CAP. Revised `ordinate`, added `formula` argument. Additional ord unit tests.

CHANGES IN VERSION 1.7.24
-------------------------

USER-VISIBLE CHANGES

	- Added support for [Partial] Constrained Analysis of Principal
Coordinates (CAP).

		- A supported/documented option in `ordinate`, supported by
`plot_ordination`.

		- This solves [Issue
312](https://github.com/joey711/phyloseq/issues/312).

	- The `ordinate` function now takes an explicit `formula` argument.

		- This facilitates reliable contrained ordination calls for:

			- CAP (this commit)

			- RDA (partial redundancy analysis)

			- CCA (constrained correspondence analysis)