Upgraded to Mustache 0.8.9.
Exclude the duplicate servlet API jar.

If Jetty begins to depend on javax.servlet, this should change.
Revert "Exclude the duplicate servlet API jar."

This reverts commit c5001badd6ebbea81c39b433574212db044349f2. It didn't fix the user's issue.
Merge remote-tracking branch 'upstream/master'