message: In cargo test's help, add that examples are built
  Also clarify that --lib runs the library's unit tests.
diff: @@ -7,7 +7,7 @@ pub fn cli() -> App {
  // subcommand aliases are handled in aliased_command()
  // .alias("t")
  .setting(AppSettings::TrailingVarArg)
  - .about("Execute all unit and integration tests of a local package")
  + .about("Execute all unit and integration tests and build examples of a local package")
  .arg(
  Arg::with_name("TESTNAME")
  .help("If specified, only run tests containing this string in their names"),
  @@ -19,7 +19,7 @@ pub fn cli() -> App {
  .last(true),
  )
  .arg_targets_all(
  - "Test only this package's library",
  + "Test only this package's library unit tests",
  "Test only the specified binary",
  "Test all binaries",
  "Test only the specified example",
  