Support non-whitespace Table creation

[abhinayagarwal]

Table created by the library is the prettified version and contains spaces between each elements which expands to the length of the largest string in the particular column. However, not all markdown users want this prettified version.

An option to disable this would be good. May be a method setPrettify(boolean) on the Table.

I want to discuss the feasibility of it before creating a PR.

[Steppschuh]

I can't think of a use-case for myself, but if you feel like it would be nice to have, go for it. Having the option can't hurt, as long as the default behavior doesn't change. Looking forward to your PR!