update devise, check for already installed answers migrations, allow longer question text

update answers-testing.gemspec

updated gemlock

comment out secure_headers, update rake task

remove secure headers

add secure_headers dependency

searchkick options into guarded initializer so other applications can define options

fix poor guard clause

check subclasses for searchkick initialization
Merge pull request #281 from 18F/feature/rc003_revisions

update devise, check for already installed answers migrations,