brute force our way into working travis selenium tests

*sigh*
bumped version to 0.20.0-preview.2
fall back to current user's credentials

using the current user was accidentally removed, rendering the Users page useless
fixes #296
Update graylog2-web-interface.conf.example

remove http settings, play doesn't support setting this in the config
these need to be set as system properties when starting the server
fixes #295
negated searches from quickvalue links. fixes #300
in-graph timerange selector is back. fixes #272
fix TZ issues in #272
hiding sidebar, rebuild graph with window size

you can hide the sidebar by calling hideSidebar() already. TODO: think about a clever position for a hide button and implement another one to show the sidebar again.

relates #298, fixes #305
Merge git://github.com/Graylog2/graylog2-web-interface into develop