Noting attribute aliases for SphinxQL SELECT clauses.
Merge pull request #800 from gyozadoc/patch-1405339819

Noting attribute aliases for SphinxQL SELECT clauses.
Updating at least the first section
Further delta docs update.
Background delta information before datetime, in order of preference/support.
Don't use backticks in straight HTML, duh.
Wrapping up deltas update to cover datetime options as well.
Link to realtime indices as an option.
Missed the start of a highlight tag.