Update config folder path.
Fix incorrect config file name.
Missed one.
Fix build errors and warnings
Merge pull request #1549 from bcrowe/3.0-build-errors

3.0 - Fix build errors and warnings
Merge pull request #1547 from cakephp/3.0-config-folder

Update config folder path.
Merge branch '3.0' into 3.0-proof-pt4

Conflicts:
	en/installation/url-rewriting.rst