Added an options parameter to body-parser with limit

[GSchutz]

fix #37

[typicode]

Hi Guilherme,

Thanks for the PR didn't even know there was such a limit :)
I'm curious about your use-case, why so much data?

Also, if there's no drawbacks, I think a higher limit can be set directly by default and the CLI option can be removed. Do you prefer me to do it or can you make another PR?

[GSchutz]

Hi typicode,

I'm building an application using SVG to create maps, and the maps will be very large, I was making a test and reach this limit (150kb) that is the default in the body-parser module.

I made your request, just added the default limit to 10mb and removed the CLI option.

[typicode]

Thanks, merging it :)