Fix schematics collection JSON.

Add missing quote and remove redundant aliases. Latest Angular CLI
releases refuses to generate anything without those changes.

src/lib/schematics/collection.json

@@ -7,28 +7,28 @@
       "description": "Adds Angular Material to the application without affecting any templates",
       "factory": "./install",
       "schema": "./install/schema.json",
-      "aliases": ["material-shell", "materialShell"]
+      "aliases": ["material-shell"]
     },
     // Create a dashboard component
     "dashboard": {
       "description": "Create a card-based dashboard component",
       "factory": "./dashboard/index",
       "schema": "./dashboard/schema.json",
-      "aliases": ["material-dashboard", "materialDashboard"]
+      "aliases": ["material-dashboard"]
     },
     // Creates a table component
     "table": {
       "description": "Create a component that displays data with a data-table",
       "factory": "./table/index",
       "schema": "./table/schema.json",
-      "aliases": ["material-table", "materialTable"]
+      "aliases": ["material-table"]
     },
     // Creates toolbar and navigation components
     "nav": {
       "description": "Create a component with a responsive sidenav for navigation",
       "factory": "./nav/index",
       "schema": "./nav/schema.json",
-      "aliases": [ "material-nav", "materialNav ]
+      "aliases": [ "material-nav"]
     },
     // Creates a address form component
     "addressForm": {