Add config options for Serializer and Formater

[alelopezperez]

Added two config options for quoting table and column name in both the Serializer and Formatter; and change the corresponding code to respect the configs.

Solves issue 1 from #69

[carllerche]

I don't see anything else. Would no table name be included at all in the fallback case?

[alelopezperez]

You are completely right, i did not put the else case so that would be an error

[carllerche]

Thanks for the PR. What do you think of creating methods for table_name and column_name that encapsulate the quote / no quote condition in one place? Would that work? I saw some spots where it seemed like the else case was left out. Was that intentional?

[alelopezperez]

So what I'm thinking is that I could make a function that get called instead of write!(self.dst, "\"{}\"", ...)?; and that function would be a method of the formatter; also it should run on the ident() function. Do you think this approach would be good?

Also thanks for responding, is my first time getting involved in a project of this scale!