fix(pipes): camelized pipe name

Fixes angular#224

BREAKING CHANGES

Before:
```
@pipe({
  name: 'FromNow'
})
```

After:
```
@pipe({
  name: 'fromNow'
})
```

Author: cexbrayat

addon/ng2/blueprints/pipe/files/src/app/pipes/__name__/__name__.ts

@@ -2,7 +2,7 @@ import {Pipe, PipeTransform} from 'angular2/core';
 
 
 @Pipe({
-  name: '<%= classifiedModuleName %>'
+  name: '<%= camelizedModuleName %>'
 })
 export class <%= classifiedModuleName %> implements PipeTransform {