Tracer web (open-telemetry#334)

* feat(tracer-web): adding tracer web

* feat(basic-tracer): adding karma tests

* feat(tracer-web): adding some example for easier debugging in browser - for development purposes

* fix: lint

* fix: creating base for karma

* fix: fixing problem with target for browser, cleanup tests

* refactor: moving polyfills for node karma tests to one file

* fix: adding missing package

* refactor: removing unneeded file

* refactor: prefixing privates, cleanup

* fix: duplicate package

* refactor: aligning tslint with other tslint packages

* refactor: cleanups, adding comments for class

* fix: linting

* fix: type

* refactor: generation of id for scope

* refactor: removed previous uid for scope as originally it was meant to be used with async which is not the case anymore

* chore: adding test for restoring scope

* fix: lint

* refactor: simplifying the stack scope manager

* chore: updating readme with basic example

* chore: fixes after merge

* fix: updating test to accept greater or equal - fails on browser

* refactor: moving example for web tracer

* refactor: removing WebTracerConfig to use BasicTracerConfig which changed recently

* chore: updating types

* chore: spacing

* chore: removing mocha tests for tracer-web

* chore: updating types and linting

* chore: updating packages after merge

* chore: adding nyc report for karma tests for browser

* chore: updating lerna script to run coverage for browsers

* feat(tracer-web): bump version to 0.1.0

api/karma.base.js

@@ -0,0 +1,26 @@
+/*!
+ * Copyright 2019, OpenTelemetry Authors
+ *
+ * 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.
+ */
+
+module.exports = {
+  listenAddress: 'localhost',
+  hostname: 'localhost',
+  browsers: ['ChromeHeadless'],
+  frameworks: ['mocha'],
+  reporters: ['spec'],
+  files: ['test/index-webpack.ts'],
+  preprocessors: { 'test/index-webpack.ts': ['webpack'] },
+  webpackMiddleware: { noInfo: true }
+};

api/webpack.node-polyfills.js

@@ -0,0 +1,52 @@
+module.exports = {
+  // Enable the assert library polyfill because that is used in tests
+  assert: true,
+  // The assert polyfill from github.com/browserify/commonjs-assert
+  // also requires the `global` polyfill.
+  global: true,
+
+  // Turn off all other Node.js API polyfills for the browser tests to
+  // make sure that we are not attempting to use Node-specific APIs in
+  // the browser code. Instead, we will write browser specific
+  // implementations of platform functionality we need under the
+  // `./src/platform/browser` folder. This allows for writing browser
+  // optimized implementations of the specific needed functionality
+  // rather than bringing in (sometimes large) polyfills for the
+  // corresponding Node APIs.
+  Buffer: false,
+  __dirname: false,
+  __filename: false,
+  buffer: false,
+  child_process: false,
+  cluster: false,
+  console: false,
+  constants: false,
+  crypto: false,
+  dgram: false,
+  dns: false,
+  domain: false,
+  events: false,
+  fs: false,
+  http: false,
+  https: false,
+  module: false,
+  net: false,
+  os: false,
+  path: false,
+  process: false,
+  punycode: false,
+  querystring: false,
+  readline: false,
+  repl: false,
+  setImmediate: false,
+  stream: false,
+  string_decoder: false,
+  sys: false,
+  timers: false,
+  tls: false,
+  tty: false,
+  url: false,
+  util: false,
+  vm: false,
+  zlib: false
+};