v0.9 - Improvements and Bugfixes

• Add new command to list all assetic resources (sp:bower:list)
• Fixed some typos
• Adjust documentation
• Dependency cache warmer is now optional (so it will not be triggered on a "soft" cache warmup)
• Generate Assetic packages only when content for scripts and/or styles isn't empty
• Create cache directory in the components directory - this way the cache must not be recreated on every cache:warmup/cache:clea