set application timezone early in application constructor, set default of UTC if no timezone is configured at all (not in app config nor in php.ini)
Merge commit '1ccce' into fix-209-default-timezone
undo commit 1ccce67f345ca33441fe22602e11cc62a31db371
mod: don't use ArrayHelper to avoid loading another class during every request
remove fix for unset timezone from bootstrap app
fix: remove pointless unset
Merge pull request #210 from bwoester/fix-209-default-timezone

Fix issue #209 default timezone