added attributes handling for ruler tag <hr>

Author: mzorz

aztec/src/main/kotlin/org/wordpress/aztec/AztecTagHandler.kt

@@ -116,7 +116,8 @@ class AztecTagHandler(val context: Context, val plugins: List<IAztecPlugin> = Ar
             LINE -> {
                 if (opening) {
                     // Add an extra newline above the line to prevent weird typing on the line above
-                    start(output, AztecHorizontalRuleSpan(context, ContextCompat.getDrawable(context, R.drawable.img_hr), nestingLevel))
+                    start(output, AztecHorizontalRuleSpan(context, ContextCompat.getDrawable(context, R.drawable.img_hr),
+                            nestingLevel, AztecAttributes(attributes)))
                     output.append(Constants.MAGIC_CHAR)
                 } else {
                     end(output, AztecHorizontalRuleSpan::class.java)

aztec/src/main/kotlin/org/wordpress/aztec/formatting/LineBlockFormatter.kt

@@ -106,6 +106,7 @@ class LineBlockFormatter(editor: AztecText) : AztecFormatter(editor) {
                 editor.context,
                 ContextCompat.getDrawable(editor.context, R.drawable.img_hr),
                 nestingLevel,
+                AztecAttributes(),
                 editor
         )
 

aztec/src/main/kotlin/org/wordpress/aztec/spans/AztecHorizontalRuleSpan.kt

@@ -6,7 +6,7 @@ import org.wordpress.aztec.AztecAttributes
 import org.wordpress.aztec.AztecText
 
 class AztecHorizontalRuleSpan(context: Context, drawable: Drawable, override var nestingLevel: Int,
-                              editor: AztecText? = null, override var attributes: AztecAttributes = AztecAttributes()) :
+                              override var attributes: AztecAttributes = AztecAttributes(), editor: AztecText? = null) :
         AztecDynamicImageSpan(context, drawable), IAztecFullWidthImageSpan, IAztecSpan {
     init {
         textView = editor