Release 0.3.9

 IMPROVEMENTS

 * tags can contain the string 'conflict' again (asottile, #119)
 * 'git-ok' tag now links to gitweb (kkellyy, #117)
 * pushmanager is now proxy aware (kkellyy, #116)
 * 'After certifying' checklist now says 'Before certifying' (kkellyy, #122)

 BUG FIXES

 * reviewboard links no longer contains the pushmanager port (kkellyy, #121)

 DEPRECATED

 * 'hoods' tag no longer has post-stage checklist steps (kkellyy, #120)