Issue parsing yaml when certain dw components included

[zachlendon]

First off - nice underrated library - thank you for your efforts on it.

In my particular tests, when using 0.3 and defining 'jerseyProviders', the configuration is parsed without throwing an exception (during startup). In 0.4, I see the error:

Exception in thread "main" while parsing a block mapping
in "", line 2, column 4:
appContextType: app
^
expected , but found BlockMappingStart
in "", line 34, column 5:
jerseyProviders:
^

If I don't include jerseyProviders, the configuration parses successfully in 0.4. I haven't yet tried defining other jersey components (beyond resources).