refactor(lib): change package structure to allow for entrypoints

* Add entrypoints for core, flex, and extended. All entrypoints have
  a module that can be imported separately
* Remove the BiDi clone from the CDK and add a direct/peer dependency

Author: CaerusKaru

build-config.js

@@ -15,6 +15,12 @@ const buildVersion = package.version;
  */
 const angularVersion = '^5.0.0';
 
+/**
+ * Required Angular CDK version for all Angular Layout packages. This version will be used
+ * as the peer dependency version for Angular CDK in all release packages.
+ */
+const cdkVersion = '^5.0.0';
+
 /** License that will be placed inside of all created bundles. */
 const buildLicense = `/**
  * @license
@@ -27,6 +33,7 @@ const buildLicense = `/**
 module.exports = {
   projectVersion: buildVersion,
   angularVersion: angularVersion,
+  cdkVersion: cdkVersion,
   projectDir: __dirname,
   packagesDir: join(__dirname, 'src'),
   outputDir: join(__dirname, 'dist'),

package-lock.json

@@ -27,6 +27,7 @@
     "node": ">= 5.4.1"
   },
   "dependencies": {
+    "@angular/cdk": "^5.2.0",
     "@angular/core": "~5.2.0",
     "@angular/common": "~5.2.0",
     "@angular/compiler": "~5.2.0",
@@ -40,7 +41,6 @@
   },
   "devDependencies": {
     "@angular/animations": "~5.2.0",
-    "@angular/cdk": "^5.2.0",
     "@angular/compiler-cli": "~5.2.0",
     "@angular/forms": "~5.2.0",
     "@angular/http": "~5.2.0",