Merge pull request #32 from tanimoto/master

Fix typos and improve consistency
Add needed type annotation. Make partial function not full function.
Insert missing Future.value. Reported by Eli Pozniansky <epozniansky@box.com>
Add a cautionary note on the default Seq/Traversable/Iterable types being mutable
Fix number agreement niggles.
Merge pull request #38 from SethMilliken/patch-3

Fix number agreement niggles.
Merge pull request #37 from orrsella/patch-1

Add a cautionary note on the default Seq/Traversable/Iterable types accepting the mutable version
add a chapter of error handling; revise the whole translation as more natural
Merge pull request #40 from scalajp/error-handling

Add "error handling" to Japanese edition
Merge pull request #35 from andrewbts/patch-1

Add needed type annotation. Make partial function not full function.
Merge pull request #1 from twitter/master

Sync