documented valid_string changes
Add $use_cdata to Format class
Merge pull request #589 from hackoh/1.7/add_use_cdata

Add $use_cdata to Format class
Documented underline option; related fuel/core#1540
missing - added
missing - added
Merge pull request #591 from kesali/1.7/develop

missing - added
documented the DB config driver
Fix wrong description.
Merge pull request #592 from koyhoge/1.7/develop

Fix wrong description.
documented the DB driver
Corrected grammar
Added an extra troubleshooting point (500 on clean install) and fixed some grammar
Merge pull request #593 from opr/1.7/develop

Fixed some small grammatical issues and typos
added missing Auth::check()
documented update_query_string()
bumped the version to 1.7.0
added the 1.7 download link
Merge branch '1.7/master' into upstream-1.7-master-merge

Conflicts:
	classes/asset/advanced.html
	classes/cli.html
	classes/format.html
	classes/uri.html
	classes/validation/validation.html
	installation/troubleshooting.html
Merge pull request #424 from kenjis/upstream-1.7-master-merge

本家 1.7/master をマージしました