Fix modules and add docs

docs/modules.md

@@ -0,0 +1,33 @@
+# Modules
+
+Angular rc.5 comes with `NgModule`.
+
+Since version `2.2.0` you can take advantage of these modules.
+
+Each category of pipes has an exported module. And one module imports all these modules.
+
+* Ng2ArrayPipesModule
+* Ng2MathPipesModule
+* Ng2BooleanPipesModule
+* Ng2StringPipesModule
+* Ng2ObjectPipesModule
+* Ng2AggregatePipesModule
+* Ng2PipesModule (imports all the module above)
+
+
+## Example
+
+```typescript
+import { NgModule } from '@angular/core';
+
+import { Ng2ArrayPipesModule, Ng2StringPipesModule } from 'angular-pipes';
+
+@NgModule({
+    imports: [
+        Ng2ArrayPipesModule,
+        Ng2StringPipesModule
+    ]
+})
+export class MyApplicationModule {}
+
+```

index.ts

@@ -17,43 +17,43 @@ export * from './src/aggregate';
 
 
 @NgModule({
-    declarations: [NG2_ARRAY_PIPES]
+    exports: [NG2_ARRAY_PIPES]
 })
 export class Ng2ArrayPipesModule {}
 
 @NgModule({
-    declarations: [NG2_MATH_PIPES]
+    exports: [NG2_MATH_PIPES]
 })
 export class Ng2MathPipesModule {}
 
 @NgModule({
-    declarations: [NG2_BOOLEAN_PIPES]
+    exports: [NG2_BOOLEAN_PIPES]
 })
 export class Ng2BooleanPipesModule {}
 
 @NgModule({
-    declarations: [NG2_STRING_PIPES]
+    exports: [NG2_STRING_PIPES]
 })
 export class Ng2StringPipesModule {}
 
 @NgModule({
-    declarations: [NG2_OBJECT_PIPES]
+    exports: [NG2_OBJECT_PIPES]
 })
 export class Ng2ObjectPipesModule {}
 
 @NgModule({
-    declarations: [NG2_AGGREGATE_PIPES]
+    exports: [NG2_AGGREGATE_PIPES]
 })
 export class Ng2AggregatePipesModule {}
 
 @NgModule({
-    imports: [
-        Ng2ArrayPipesModule,
-        Ng2MathPipesModule,
-        Ng2BooleanPipesModule,
-        Ng2StringPipesModule,
-        Ng2ObjectPipesModule,
-        Ng2AggregatePipesModule
+    exports: [
+        NG2_ARRAY_PIPES,
+        NG2_MATH_PIPES,
+        NG2_BOOLEAN_PIPES,
+        NG2_STRING_PIPES,
+        NG2_OBJECT_PIPES,
+        NG2_AGGREGATE_PIPES
     ]
 })
 export class Ng2PipesModule {}

package.json

@@ -1,6 +1,6 @@
 {
   "name": "angular-pipes",
-  "version": "2.2.0",
+  "version": "2.2.1",
   "description": "Angular 2 pipes library",
   "main": "pipes/index.js",
   "scripts": {