* Update WORKSPACE for latest Envoy

* Update Jenkinsfile to use bazel 0.4.5

* update testutils

* bazel clean

* fix travis

This PR is a bit overloaded and includes a lot of changes,
but it would be impossible to split them up:

 1. Emscripten: update to 1.38.48.
 2. Emscripten: use "upstream" instead of "fastcomp".
 3. Emscripten: use STANDALONE_WASM=1.
 4. Emscripten: use __wasm_global_ctors.
 5. Emscripten: use WASI calls.
 6. Emscripten: drop underscore prefix.
 7. Emscripten: remove support for the JavaScript-flavored Emscripten.
 8. Runtimes: throw WasmException for function call errors.
 9. Tests: catch DivByZero (which is now an runtime error).
10. WAVM: update to 2019-10-15.
11. WAVM: stop using WAVM's Emscripten implementation, since we have our own.
12. SDK: distribute static libraries instead of the bytecode.

Fixes #77, #212.

Signed-off-by: Piotr Sikora <piotrsikora@google.com>

We don't need it anymore. Missed in #260.

Signed-off-by: Piotr Sikora <piotrsikora@google.com>

Merge envoy[release/v1.28] into envoy-openssl[release/v1.28]

**Commit Message**
Added a usage-based ratelimiting section in the docs. Making it easier
for people to understand how to configure rate-limiting.

**Related Issues/PRs (if applicable)**
Fixes #242

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Signed-off-by: melsal13 <mmvsal13@gmail.com>

**Commit Message**

The model name is extracted by AI Gateway filter, not the one explicitly
added by downstream clients.


**Related Issues/PRs (if applicable)**

Follow up on #260

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Signed-off-by: Takeshi Yoneda <t.y.mathetake@gmail.com>