rusterize

**NOTE**: travis test with rust 1.10 fails because 1.10 does not support `#[cfg(feature(...)]` for conditional macro execution. I don't think there is any need to spend time on this, since...

@est31 It can't be put in a separate crate, because the `log..` functions are intended to log both the acual error **and** the chain of errors (the causes). If we...

@Yamakaky what do you think about adding a set of functions to log erros (using the log crate) that are added to the ResultExt trait? The functions would be: `loge()`:...