APPLICATION_SECRET required to run play on heroku
APPLICATION_SECRET required to run play on heroku

I got this error when following heroku.md manual instructions, setting
APPLICATION_SECRET fixed it for me.

2015-10-27T20:23:45.362643+00:00 app[web.1]: [error] p.a.l.CryptoConfigParser - The application secret has not been set, and we are in prod mode. Your application is not secure.
2015-10-27T20:23:45.362791+00:00 app[web.1]: [error] p.a.l.CryptoConfigParser - To set the application secret, please read http://playframework.com/documentation/latest/ApplicationSecret
2015-10-27T20:23:45.379405+00:00 app[web.1]: [error] p.c.s.n.PlayDefaultUpstreamHandler - Cannot invoke the action
2015-10-27T20:23:45.379408+00:00 app[web.1]: com.google.inject.ProvisionException: Unable to provision, see the following errors:
2015-10-27T20:23:45.379410+00:00 app[web.1]:
2015-10-27T20:75bef7f3103b83629ca809b5b54e57b475393116@6o0l4eg03: Configuration error
2015-10-27T20:23:45.379412+00:00 app[web.1]:   while locating play.api.libs.CryptoConfigParser
2015-10-27T20:23:45.379412+00:00 app[web.1]:   while locating play.api.libs.CryptoConfig
2015-10-27T20:23:45.379413+00:00 app[web.1]:     for parameter 0 at play.api.libs.Crypto.<init>(Crypto.scala:282)
2015-10-27T20:23:45.379414+00:00 app[web.1]:   at play.api.inject.BuiltinModule.bindings(BuiltinModule.scala:48):
2015-10-27T20:23:45.379415+00:00 app[web.1]: Binding(class play.api.libs.Crypto to self) (via modules: com.google.inject.util.Modules$OverrideModule -> play.api.inject.guice.GuiceableModuleConversions$$anon$1)
2015-10-27T20:23:45.379416+00:00 app[web.1]:   while locating play.api.libs.Crypto

guardian/gu-who,BanzaiMan/gu-who