Format code and add fmt config

[TimTheBig]

This patch adds a rustfmt config then formats the code. It also enables git LF normalization.

I configured rustfmt as such:

max_width = 95
fn_call_width = 62
chain_width = 62

use_field_init_shorthand = true
match_block_trailing_comma = true

# unstable
reorder_impl_items = true
where_single_line = true
normalize_comments = true

let me know if you have any question about why I picked a value.