Add test cases for single quoted tag values

Neither double quotes nor single quotes should not be escaped when
they are used inside of a tag. That is, the following should all
result in the same HTML:

* [tag=value param=value]
* [tag='value' param='value']
* [tag="value" param="value"]

tests/ConformanceTest.php

@@ -129,6 +129,16 @@ public function provideSpecialCharacterTests() {
                 'html' => "This <woo!> &\"yeah!\" 'sizzle'",
                 'escape_content' => false,
             ]],
+            [[
+                'descr' => "Single quotes in tags are NOT considered special characters.",
+                'bbcode' => "[wiki='foo' title='bar']",
+                'html' => "<a href=\"/?page=foo\" class=\"bbcode_wiki\">bar</a>",
+            ]],
+            [[
+                'descr' => "Double quotes in tags are NOT considered special characters.",
+                'bbcode' => "[wiki=\"foo\" title=\"bar\"]",
+                'html' => "<a href=\"/?page=foo\" class=\"bbcode_wiki\">bar</a>",
+            ]],
             [[
                 'descr' => ":-) produces a smiley <img> element.",
                 'bbcode' => "This is a test of the emergency broadcasting system :-)",
@@ -384,10 +394,15 @@ public function provideInlineConversionTests() {
                 'html' => "This is a test of the <span style=\"font-family:'Times New Roman'\">emergency broadcasting system</span>.",
             ]],
             [[
-                'descr' => "[font=\"Courier New\"] gets correctly converted (quoted default value).",
+                'descr' => "[font=\"Courier New\"] gets correctly converted (double quoted default value).",
                 'bbcode' => "This is a test of the [font=\"Courier New\"]emergency broadcasting system[/font].",
                 'html' => "This is a test of the <span style=\"font-family:'Courier New'\">emergency broadcasting system</span>.",
             ]],
+            [[
+                'descr' => "[font='Courier New'] gets correctly converted (single quoted default value).",
+                'bbcode' => "This is a test of the [font='Courier New']emergency broadcasting system[/font].",
+                'html' => "This is a test of the <span style=\"font-family:'Courier New'\">emergency broadcasting system</span>.",
+            ]],
             [[
                 'descr' => "[font=\"Courier New\" blarg size=1] gets converted (floating parameter ignored).",
                 'bbcode' => "This is a test of the [font=\"Courier New\" blarg size=1]emergency broadcasting system[/font].",