Fix spelling errors.
Change future tense to present since Scala 2.10 is current now.
Clarify the different states of a Future.
Add mention of computation return type in intro to Future.
Correct implementation of first(f, g) and add clarification.
Update and simplify mention of Jekyll requirement.
Update reference to Jekyll.
Fix my bad Markdown.
Fix "irregardless" to "regardless".
Merge pull request #220 from FranklinChen/futures-overview-fix

Futures overview and readmes