adding tags attribute for a key

Change-Id: I6edd50b93133f920245dac2188b2f9e9a37c82c3

Author: menny

api/build.gradle

@@ -8,7 +8,7 @@ android {
         minSdkVersion 7
         targetSdkVersion 23
         versionCode 3
-        versionName "1.3.6"
+        versionName "1.4.0"
     }
     buildTypes {
         release {

api/src/main/res/values/keyboard_layout_api.xml

@@ -87,5 +87,8 @@ Copyright (C) 2013 Menny Even-Danan
 
         <!-- The characters to display as a hint for the popup keyboard -->
         <attr name="hintLabel" format="string"/>
+
+        <!-- coma separated tags for this key. Might be used for completions -->
+        <attr name="tags" format="string"/>
     </declare-styleable>
 </resources>