more docs, sort examples

examples/1-hello.rs

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+//! Device specific version of "Hello, world!"
+//!
+//! Prints "Hello, world!" on the OpenOCD console using semihosting
+
+#![feature(used)]
+#![no_std]
+
+#[macro_use]
+extern crate cortex_m;
+extern crate cortex_m_rt;
+extern crate {{name}};
+
+use {{name}}::interrupt;
+
+fn main() {
+    hprintln!("Hello, world!");
+}
+
+// This is the device specific bit: properly populated interrupt handlers
+// Tough we are not using any of them in this example
+#[allow(dead_code)]
+#[used]
+#[link_section = ".rodata.interrupts"]
+static INTERRUPTS: interrupt::Handlers =
+    interrupt::Handlers { ..interrupt::DEFAULT_HANDLERS };