#79 Export to Meal Master format

[John Duckworth]

Please add additional exporting capabilities. The best
would be an export to Meal Mster format since that
seems to be a universal recipe format that most
programs can read.

There may be times where I was to import recipes into
other programs (such as a Palm app) and there is no
easy way to do that from phpRecipeBook currently.

I am not yet confortable enough with parsing .xml files
to do a converter myself (although I have tried).