Merge remote-tracking branch 'rimutaka/master' into merge_branch

* rimutaka/master: (26 commits)
  Removed unnecessary + Sync on handler's future
  Added docs and missing _vars to reduce warnings
  Enforced Send+Sync for http Handler impl.
  Added some tracing!() to lib.rs.
  Fixed "Process exited" error in lib.rs.
  client.rs formatting fix
  Log panic as Debug+Display, improved examples
  Added err logging to lib.rs, consolidated examples
  Added error handling for awslabs#241, interim, broken.
  Removed unused refs from basic.rs
  disable time on `tracing_subscriber`
  Add log and tracing examples; fix `tracing` dependency features.
  Upper-cased and edited examples/readme.md
  Corrected handler_fn interface misconception in basic.rs
  Fixed comment in lib.rs
  Formatting fix in error-handling.rs.
  Fixed headers in examples readme.
  Tidied up examples readme.
  Added basic.rs example, comments to other examples
  Log handler errors in runtime. Issue awslabs#241
  ...

Author: calavera

.gitignore

@@ -1,6 +1,7 @@
 /target
 /.cargo
 lambda-runtime/libtest.rmeta
+Cargo.lock
 
 # Built AWS Lambda zipfile
 lambda.zip