ENH: Add plot_predict method to ARIMA models.
DOC: Add plot_predict to release notes.
DOC: Silence bullet list warnings.
EX: Add plot_predict to ARMA example
DOC: Add example for plot_predict
DEV: Misc cruft.
TST: Smoke test for plot_predict
STY: Cleanup
COMPAT: Python 2.6 format args
Merge pull request #1563 from jseabold/plot-forecast

ENH: Add plot_predict method to ARIMA models.