feat(router): make default app configurable

[deis-bot]

@krancour, @arschles and @robholland are potential reviewers of this pull request based on my analysis of git blame information. Thanks @lachie83!

[codecov-io]

Current coverage is 55.58% (diff: 100%)

Merging #302 into master will increase coverage by 0.34%

@@             master       #302   diff @@
==========================================
  Files             6          6          
  Lines           382        385     +3   
  Methods           0          0          
  Messages          0          0          
  Branches          0          0          
==========================================
+ Hits            211        214     +3   
  Misses          151        151          
  Partials         20         20          

Powered by Codecov. Last update ee87845...4ca3a74

[bacongobbler]

If you wouldn't mind amending your commit such that it follows the commit style guide, that would be awesome! That way it'll get picked up by deisrel when we generate the release changelog. Thanks!

[lachie83]

@bacongobbler updated commit messgae