fix(replaceable): removed replaceable

BREAKING CHANGE: This commit removes the replaceable custom attribute.
Now that Shadow DOM v1 Slots are implemented there is no more need for
this. Replaceable parts for template controllers are still supported
for if, repeat, etc. via the part attribute.

src/aurelia-templating-resources.js

@@ -5,7 +5,6 @@ import {Repeat} from './repeat';
 import {Show} from './show';
 import {Hide} from './hide';
 import {SanitizeHTMLValueConverter} from './sanitize-html';
-import {Replaceable} from './replaceable';
 import {Focus} from './focus';
 import {ViewEngine} from 'aurelia-templating';
 import {_createCSSResource} from './css-resource';
@@ -49,7 +48,6 @@ function configure(config) {
     './repeat',
     './show',
     './hide',
-    './replaceable',
     './sanitize-html',
     './focus',
     './binding-mode-behaviors',
@@ -78,7 +76,6 @@ export {
   Hide,
   HTMLSanitizer,
   SanitizeHTMLValueConverter,
-  Replaceable,
   Focus,
   configure,
   OneTimeBindingBehavior,