Fix del, strike and s handle (#1, #2)

* Remark.java - add "del", "strike", "s" tags to whitelisting (line 88-89) otherwise these tags are stripped off by the `cleaner`
* DocumentConverter - also add "del,strike,s" tags (on line 88) to inline nodes with `InlineStyle` handler

src/main/java/com/overzealous/remark/Remark.java

@@ -85,7 +85,8 @@ public Remark(Options options) {
                                               "h1", "h2", "h3", "h4", "h5", "h6",
                                               "table", "tbody", "td", "tfoot", "th", "thead", "tr",
                                               "hr",
-                                              "span", "font")
+                                              "span", "font",
+                                              "del", "strike", "s")
 									  .addAttributes("th", "colspan", "align", "style")
 									  .addAttributes("td", "colspan", "align", "style")
 									  .addAttributes(":all", "title", "style");

src/main/java/com/overzealous/remark/convert/DocumentConverter.java

@@ -85,7 +85,7 @@ public DocumentConverter(Options options) {
 	}
 
 	private void configureNodes() {
-		addInlineNode(new InlineStyle(),	"i,em,b,strong,font,span");
+		addInlineNode(new InlineStyle(),	"i,em,b,strong,font,span,del,strike,s");
 		addInlineNode(new InlineCode(),		"code,tt");
 		addInlineNode(new Image(),			"img");
 		addInlineNode(new Anchor(),			"a");

src/test/resources/conversions/html/unknownHTML.html

@@ -2,6 +2,6 @@
 	Division
 </div>
 
-<p><foo-bar class="fred">Foo Bar</foo-bar></p>
+<p><foo-bar class="foo">Foo Bar</foo-bar></p>
 
 <p><var class="barney"><em>Variable</em></var></p>

src/test/resources/conversions/markdown/unknownHTML-allowed.md

@@ -1,5 +1,5 @@
 Division
 
-<foo-bar class="fred">Foo Bar</foo-bar>
+<foo-bar class="foo">Foo Bar</foo-bar>
 
 <var><em>Variable</em></var>