feat: update RxJS peer dependency to 5.0.0-rc.4

Closes #13125

RxJS from beta-12 to rc.4, has removed the `cache`
operator. (See https://github.com/ReactiveX/rxjs/blob/master/CHANGELOG.md#breaking-changes-1)
If your application relies on it, then we suggest 
that you use the one from this gist:
https://gist.github.com/robwormald/19dea0c70a6e01aadced6731aed4f9f7

modules/@angular/benchpress/package.json

@@ -7,7 +7,7 @@
   "dependencies": {
     "@angular/core": "^2.0.0-rc.7",
     "reflect-metadata": "^0.1.2",
-    "rxjs": "5.0.0-beta.12",
+    "rxjs": "5.0.0-rc.4",
     "jpm": "1.1.4",
     "firefox-profile": "0.4.0",
     "selenium-webdriver": "^2.53.3"

modules/@angular/core/package.json

@@ -8,7 +8,7 @@
   "author": "angular",
   "license": "MIT",
   "peerDependencies": {
-    "rxjs": "5.0.0-beta.12",
+    "rxjs": "5.0.0-rc.4",
     "zone.js": "^0.6.21"
   },
   "repository": {

modules/@angular/http/package.json

@@ -8,7 +8,7 @@
   "author": "angular",
   "license": "MIT",
   "peerDependencies": {
-    "rxjs": "5.0.0-beta.12",
+    "rxjs": "5.0.0-rc.4",
     "@angular/core": "0.0.0-PLACEHOLDER",
     "@angular/platform-browser": "0.0.0-PLACEHOLDER"
   },

modules/@angular/router/package.json

@@ -24,6 +24,6 @@
     "@angular/core": "0.0.0-PLACEHOLDER",
     "@angular/common": "0.0.0-PLACEHOLDER",
     "@angular/platform-browser": "0.0.0-PLACEHOLDER",
-    "rxjs": "5.0.0-beta.12"
+    "rxjs": "5.0.0-rc.4"
   }
 }

modules/rollup-test/package.json

@@ -23,7 +23,7 @@
     "rollup-plugin-node-resolve": "^1.5.0",
     "rollup-plugin-typescript": "^0.7.3",
     "rollup-plugin-uglify": "^0.3.1",
-    "rxjs-es": "^5.0.0-beta.12",
+    "rxjs-es": "^5.0.0-rc.4",
     "typescript": "^1.9.0-dev.20160423",
     "uglify-js": "^2.6.2"
   },

npm-shrinkwrap.clean.json

@@ -3872,7 +3872,7 @@
       "version": "1.5.2"
     },
     "rxjs": {
-      "version": "5.0.0-beta.12"
+      "version": "5.0.0-rc.4"
     },
     "sauce-connect-launcher": {
       "version": "0.13.0",
@@ -4122,7 +4122,7 @@
       "version": "2.0.0"
     },
     "symbol-observable": {
-      "version": "1.0.2"
+      "version": "1.0.4"
     },
     "systemjs": {
       "version": "0.18.10"

npm-shrinkwrap.json

@@ -6174,9 +6174,9 @@
       "resolved": "https://registry.npmjs.org/rollup-pluginutils/-/rollup-pluginutils-1.5.2.tgz"
     },
     "rxjs": {
-      "version": "5.0.0-beta.12",
+      "version": "5.0.0-rc.4",
-      "from": "rxjs@5.0.0-beta.12",
+      "from": "rxjs@5.0.0-rc.4",
-      "resolved": "https://registry.npmjs.org/rxjs/-/rxjs-5.0.0-beta.12.tgz"
+      "resolved": "https://registry.npmjs.org/rxjs/-/rxjs-5.0.0-rc.4.tgz"
     },
     "sauce-connect-launcher": {
       "version": "0.13.0",
@@ -6572,9 +6572,9 @@
       "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-2.0.0.tgz"
     },
     "symbol-observable": {
-      "version": "1.0.2",
+      "version": "1.0.4",
       "from": "symbol-observable@>=1.0.1 <2.0.0",
-      "resolved": "https://registry.npmjs.org/symbol-observable/-/symbol-observable-1.0.2.tgz"
+      "resolved": "https://registry.npmjs.org/symbol-observable/-/symbol-observable-1.0.4.tgz"
     },
     "systemjs": {
       "version": "0.18.10",

package.json

@@ -20,7 +20,7 @@
   "dependencies": {
     "core-js": "^2.4.1",
     "reflect-metadata": "^0.1.3",
-    "rxjs": "5.0.0-beta.12",
+    "rxjs": "5.0.0-rc.4",
     "zone.js": "^0.6.25"
   },
   "devDependencies": {

scripts/ci-lite/offline_compiler_test.sh

@@ -10,7 +10,7 @@ PKGS=(
   reflect-metadata@0.1.8
   typescript@2.0.2
   zone.js@0.6.25
-  rxjs@5.0.0-beta.12
+  rxjs@5.0.0-rc.4
   @types/{node@6.0.38,jasmine@2.2.33}
   jasmine@2.4.1
   webpack@2.1.0-beta.21