Parsing key-value pairs

**Issue by [mr-miles](https://github.com/mr-miles)**
_Wednesday Mar 26, 2014 at 18:36 GMT_
_Originally opened as https://github.com/gsscoder/commandline/issues/122_

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Is it possible to use the parser to populate key-value pairs?

So something like "myapp.exe -v:a=x -v:b=y -v:c=z" would populate a property v which is a Dictionary with (a,x), (b,y), (c,z) values?

I want to use the parser to specify replacements to be made on a text file

Great package by the way!