Fixed some dialog closing bugs
Added dialog when attempting to open a stream twice
Disabled cache for twitch api requests

The twitch models and this simple jQ ajax call will hopefully soon be replaced by ember data with proper adapters and serializers. EmberData.EmbeddedRecordsMixin not yet ready...
Fixed bug when trying to refresh the error route
Fixed missing stream quality fallbacks. resolves #15
Fixed infinite scroll not fetching when the window size changes

Also added a threshold for triggering the willFetchContent action, so it can start to load earlier.
The issue with the initial item fetch number still needs to be addressed.