itemView, fixes, whitespace

First, apologies for the massive change in whitespace. It's a band-aid that has needed to be pulled, and I hope the new spacing will improve legibility and eliminate inconsistent indentations. Release features and fixes:

• Adds "itemView" binding option for parameterizing collection bindings.
• Fixes bug with undefined collectionView reference (thanks @adamsea).
• Prevents race condition between reset() and in-flight events (thanks @disruptek).
• Changed whitespace from tabs to spaces.
• Refactored docs into Middleman app.