Initial check in of the speech-commands project (tensorflow#50)

* Initial check in of the speech-commands project

- Add python script for wav-to-dat conversion, which prepares the
  data for WebAudio FFT conversionin the browser: prep_wavs.py
- Add unit tests for prep_wavs.py: prep_wavs_test.py
- Add pylint config file (.pylintrc)
- Add README.md
- Include Python dev info in README.md
- Add Python build (run_python_tests.sh) to Travis.

.gitignore

@@ -9,3 +9,5 @@ dist/
 **/*/.yalc
 
 .rpt2_cache/
+
+*.pyc

.travis.yml

@@ -1,9 +1,18 @@
-language: node_js
-node_js:
-  - '8'
-  - '10'
-script:
-  - yarn presubmit
-cache: yarn
 git:
   depth: 5
+matrix:
+  include:
+    - language: node_js
+      node_js:
+        - '8'
+        - '10'
+      script:
+        - yarn presubmit
+      cache: yarn
+      git:
+        depth: 5
+
+    - langauge: python
+      python: 3.5
+      script:
+        - ./run_python_tests.sh

run_python_tests.sh

@@ -0,0 +1,23 @@
+#!/bin/bash
+# Copyright 2018 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+# ==============================================================================
+
+# Run all Python tests in this tfjs-models repository.
+
+set -e
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+
+"${SCRIPT_DIR}/speech-commands/training/browser-fft/py_lint_and_test.sh"

speech-commands/package.json

@@ -0,0 +1,15 @@
+{
+  "name": "@tensorflow-models/speech-commands",
+  "version": "0.1.0",
+  "description": "Speech-command recognizer in TensorFlow.js",
+  "peerDependencies": {
+    "@tensorflow/tfjs": "^0.12.3"
+  },
+  "devDependencies": {
+    "@tensorflow/tfjs": "^0.12.3"
+  },
+  "scripts": {
+    "build": "echo 'No-op for now.'"
+  },
+  "license": "Apache-2.0"
+}