Angular 6 (#556)

* upgrade to angular 6 (with rxjs-compat)

* fix tests

* fix test scripts

* upgrade rxjs to 6.0

* remove rxjs-compat layer

* update unit tests

* restore tests

* context-menu transparent backdrop

* upgrade libs

* changed snackbar locator

* locator as class

* remove locator element reference

* snackbar locators

* wait for snackbar before executing the action button

* expect cdk-overlay before mat-menu-panel condition

* update libs

tsconfig.json

@@ -1,16 +1,28 @@
 {
-    "compileOnSave": false,
-    "compilerOptions": {
-        "outDir": "./dist/out-tsc",
-        "sourceMap": true,
-        "declaration": false,
-        "moduleResolution": "node",
-        "emitDecoratorMetadata": true,
-        "experimentalDecorators": true,
-        "noUnusedLocals": true,
-        "target": "es5",
-        "typeRoots": ["node_modules/@types"],
-        "lib": ["es2017", "dom"]
-    },
-    "exclude": ["node_modules"]
-}
+  "compileOnSave": false,
+  "compilerOptions": {
+    "outDir": "./dist/out-tsc",
+    "sourceMap": true,
+    "declaration": false,
+    "moduleResolution": "node",
+    "emitDecoratorMetadata": true,
+    "experimentalDecorators": true,
+    "noUnusedLocals": true,
+    "target": "es5",
+    "typeRoots": [
+      "node_modules/@types"
+    ],
+    "lib": [
+      "es2017",
+      "dom"
+    ],
+    "module": "es2015",
+    "baseUrl": "./"
+  },
+  "exclude": [
+    "node_modules"
+  ],
+  "angularCompilerOptions": {
+    "preserveWhitespaces": false
+  }
+}