logviewer tries to determine log directory via logback configuration, falls back to storm.home/logs
use File methods to construct paths
Fix sys stats cookie being lost from UI requests
Replace wrapper helper around core UI app

This will once again wrap cookies, sessions, etc., in a proper way.  See
compojure.handler/site.
add logviewer.appender.name config
logviewer locates log directory via appender named in storm config

exits on startup if it can't find the appender
throw RuntimeException and remove unnecessary System/exit
clearer arg name
add shell bolt pending limit in fresh branch
remove instanceof check
Merge pull request #705 from strongh/logview-logback

logviewer tries to determine log directory via logback configuration
Merge pull request #730 from xiaokang/limit-shell-pending

add config to limit ShellBolt internal _pendingWrites queue length
Merge pull request #710 from d2r/d2r-sys-stats-toggle-fix

Fix sys stats cookie being lost from UI requests
update changelog for 0.9.0-rc3