removed core code, referenced remote 3.0.0.rc1 core, migrated code to latest core changes

Author: jonasjabari

Gemfile.lock

@@ -1,7 +1,8 @@
 PATH
   remote: .
   specs:
-    matestack-ui-vue_js (3.0.0)
+    matestack-ui-vue_js (3.0.0.rc1)
+      matestack-ui-core (~> 3.0.0.rc1)
       rails (>= 5.2)
 
 GEM
@@ -109,6 +110,8 @@ GEM
     mail (2.7.1)
       mini_mime (>= 0.1.1)
     marcel (1.0.2)
+    matestack-ui-core (3.0.0.rc1)
+      rails (>= 5.2)
     method_source (1.0.0)
     mini_mime (1.1.2)
     mini_portile2 (2.7.1)