Aggrigate issue view
Merge pull request #95 from indication/aggrigate_issue_view

Fix issue view icon
Reduce webview instance
Refactor parse handler
Fix url schema that cross site scripting
Refactor generating anchor tag
Refactor refuge pre tags
Refactor inline url matcher
Refactor wiki anchor
Refactor issue anchor
Separate RefugeTextPre from convertTextileToHtml
Refactor and use common interface