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Extract compute_asset_path helper
Extract digest_assets option
Extract debug assets option
Whitespace
Extract compile assets option
Use define_method to capture config in scope
Add config option for assets prefix
compile is on
Add option for assets manifest
Add assets environment option
Use local asset_host configuration
Remove stubbed Rails config

Closes #1
Test manifest path
Check if config is defined?
Require environment to compile
Test sprockets url generation
Only set asset environment if compile is on
Fix indent
Cleanup sprockets test context class setters