Fix privacy warnings. - Githubissues

Using the latest nightly compiler (1.8.0), these warnings are generated compiling PTO:

src/bridge.rs:238:76: 238:80 warning: private type in public interface, #[warn(private_in_public)] on by default
src/bridge.rs:238     pub fn room_from_matrix(&mut self, id: &matrix::model::RoomID) -> &mut Room {
                                                                                             ^~~~
src/bridge.rs:238:76: 238:80 warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
src/bridge.rs:238:76: 238:80 note: for more information, see the explanation for E0446 (`--explain E0446`)
src/bridge.rs:248:65: 248:69 warning: private type in public interface, #[warn(private_in_public)] on by default
src/bridge.rs:248     pub fn room_from_irc(&mut self, id: &String) -> Option<&mut Room> {
                                                                                  ^~~~
src/bridge.rs:248:65: 248:69 warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
src/bridge.rs:248:65: 248:69 note: for more information, see the explanation for E0446 (`--explain E0446`)

This PR fixes the warnings (which are going to be an error) by removing the pub qualifier on these to functions, as they do not seem to need it.

tdfischer / pto

Fix privacy warnings. #35