Several small improvements in the webconf invitation email

Better layout for the email, better time zones and internationalization and
changed the strings a bit.

To be continued at #1364, #1365
Show temporary page for users not yet approved. refs #1062
Allow param expanded_post for users
some small improvements
Remove images mistakenly added in b615cb1ad
Setup travis.yml for build
Fix setting the record flag when creating meetings

Was using the wrong attribute name.
Small refactoring in custom_bbb_rooms_controller
DRY allowed params code
Correct and refactor stuff from private messages
Pull small changes in some tests from mconf-rnp/mconf-web
Update bigbluebutton_rails, now with resque-scheduler
Merge branch 'small_improv' of git://github.com/adrianob/mconf-web into adrianob-small_improv
Tests for PR #41
Merge PR #41
Merge branch 'master' into branch-v2-feature1062
Improve pending approval page's layout and strings

refs #1062
Tests for the new approval page in #42

refs #1062
Organize all features for Site flags in a folder
Fix css image urls to use the image-url helper

Otherwise the images won't be found in production.