#515 Add formatting style

[Josh Marshall]

I'd like to have a coding style which is currently unsupported by astyle. In particular, some scoping and multi line formatting. Here are a few examples:

https://github.com/anadon/madlib/blob/graph-dev/include/general_graph_functions.hpp
https://github.com/anadon/madlib/blob/graph-dev/include/general_graph_data.hpp

Briefly, I would like to have the following:
template<
typename A ,
...
typename Z >
return::type::scope::
return-type
function:scope::
function-name(
__type arg1 ,
...
typen n
){
...
}

I have to do this often because I have found myself constantly running out of horizontal space and this format keeps everything much more clear.