Add a date when the HTML file was updated.
Should've been with previous commit.
Allow for rake and output to be done together or separately through command line options.  Added a help message to the same effect.  Fixes #8
Merge branch 'issue-8'

* issue-8:
  Allow for rake and output to be done together or separately through command line options.  Added a help message to the same effect.  Fixes #8
  Should've been with previous commit.
  Add a date when the HTML file was updated.