prevent "Warning: missing space before text for line [nn] of jade file ..."

When reloading pages in my local install, I was noticing the warnings below. This change makes them go away.
````
Warning: missing space before text for line 23 of jade file "/vagrant/views/shared/tasks/task.jade"
Warning: missing space before text for line 100 of jade file "/vagrant/views/options/social/challenges.jade"
Warning: missing space before text for line 114 of jade file "/vagrant/views/options/social/challenges.jade"
Warning: missing space before text for line 14 of jade file "/vagrant/views/options/social/boss.jade"
Warning: missing space before text for line 70 of jade file "/vagrant/views/options/social/boss.jade"
Warning: missing space before text for line 5 of jade file "/vagrant/views/options/social/challenge-box.jade"
Warning: missing space before text for line 5 of jade file "/vagrant/views/options/social/challenge-box.jade"
Warning: missing space before text for line 94 of jade file "/vagrant/views/options/social/group.jade"
Warning: missing space before text for line 5 of jade file "/vagrant/views/options/social/challenge-box.jade"
Warning: missing space before text for line 94 of jade file "/vagrant/views/options/social/group.jade"
````
NB: Some of the line numbers don't match reality because the warning mechanism seems to not count comments and blank lines.