Add height and width options, Cell Comments

[frenchsomething]

Adding parameters for row height and column width Will iterate through all selected/specified rows and/or columns as applicable, and set height and width as defined

Adding cell comments The PSExcel comment methods only allow adding a comment to one cell at a time, so I had to iterate over all cells in an arbitrary cell range to avoid errors (and failure to apply comment to more than the first cell) if more than one cell is specified.

[mi-hol]

@RamblingCookieMonster are you considering to merge this PR?

[clijsters]

If I would be an active contributor I would blame you for your whitespace mess. But I'm not.

[RamblingCookieMonster]

Yikes, somehow missed this!

I'd be happy to merge, will see if I have time to s/tab/spaces at some point and merge this in.

Cheers!