ci(appveyor): enable windows build test (#2909)

* chore(package): update script for windows compatibility

* ci(appveyor): enable windows build test

appveyor.yml

@@ -0,0 +1,20 @@
+environment:
+  matrix:
+  # node.js
+    - nodejs_version: "6"
+    - nodejs_version: "7"
+    - nodejs_version: "8"
+
+install:
+  - ps: Install-Product node $env:nodejs_version
+  - set PATH=%APPDATA%\npm;%PATH%
+  - node -v && npm -v
+  - npm install
+
+build_script:
+  - npm run build_spec
+
+test_script:
+  - npm run cover
+
+version: "{build}"

package.json

@@ -87,7 +87,7 @@
     "compile_dist_esm2015": "tsc ./dist/src/Rx.ts ./dist/src/add/observable/of.ts -m es2015   --lib es5,es2015.iterable,es2015.collection,es2015.promise,dom --sourceMap --outDir ./dist/esm2015 --target es2015 --diagnostics --pretty --noImplicitAny --noImplicitReturns --noImplicitThis --suppressImplicitAnyIndexErrors --moduleResolution node",
     "compile_dist_esm2015_for_docs": "tsc ./dist/src/Rx.ts ./dist/src/add/observable/of.ts ./dist/src/MiscJSDoc.ts -m es2015   --sourceMap --outDir ./dist/es6 --target es2015 -d --diagnostics --pretty --noImplicitAny --noImplicitReturns --noImplicitThis --suppressImplicitAnyIndexErrors --moduleResolution node",
     "compile_dist_esm5_for_rollup": "tsc  ./dist/src/Rx.ts ./dist/src/add/observable/of.ts -m es2015   --lib es5,es2015.iterable,es2015.collection,es2015.promise,dom --sourceMap --outDir ./dist/esm5_for_rollup  --target ES5    --diagnostics --pretty --noImplicitAny --noImplicitReturns --noImplicitThis --suppressImplicitAnyIndexErrors --moduleResolution node --noEmitHelpers",
-    "copy_sources": "mkdir -p dist && rsync -a ./src/ ./dist/src",
+    "copy_sources": "mkdirp dist && shx cp -r ./src/ ./dist/src",
     "cover": "shx rm -rf dist/cjs && tsc dist/src/Rx.ts dist/src/add/observable/of.ts -m commonjs --lib es5,es2015.iterable,es2015.collection,es2015.promise,dom --outDir dist/cjs --sourceMap --target ES5 -d && nyc --reporter=lcov --reporter=html --exclude=spec/support/**/* --exclude=spec-js/**/* --exclude=node_modules mocha --opts spec/support/default.opts spec-js",
     "decision_tree_widget": "cd doc/decision-tree-widget && npm run build && cd ../..",
     "doctoc": "doctoc CONTRIBUTING.md",