translate 05-basic-def.md into Chinese.
use more appropriate wording
change wording
Merge remote-tracking branch 'upstream/master'
translate 06-Scopes.md into Chinese
translate 07-More-About-Settings.md into Chinese
fix wording
change some wording
Merge remote-tracking branch 'upstream/master'
Update 11-Custom-Settings.md
Simple review and bug fixed
part of 12-full-def
Fixed typos; installaing -> installing
Deleted documentation referencing ivy.cache-directory.

This configuration seems has been deleted. I couldn't find anything related to it in the code.
Update 02-Community-Plugins.md

The original xsbt-coveralls-plugin is no longer maintained, and the author now links to the maintained version. This commit updates the link to the maintained version.
Add sbt-doctest
Bump release version to sbt 0.13.6
Give HTTPS download urls for SBT

...in celebration of SBT 0.13.6, which uses HTTPS to access Maven Central.
Use HTTPS urls in preference, where available
Fix invalid links in japanese tutorial