Merge chroot for interpreters RFE

In 2010 @dennmart implemented a patch for interpreters which allow
them to chroot. This patch was provided in:

http://code.google.com/p/cherokee/issues/detail?id=767 (GitHub #646)

Thanks a million for giving us a reference!
Use the I/O cache with handler_cgi_base and handler_cgi.

Fix #411
Merge pull request #1053 from cherokee/cgi_iocache

Use the I/O cache with handler_cgi_base and handler_cgi.
Update the documentation numbers, and phase.
Merge pull request #1054 from cherokee/sources_chroot

Sources chroot
Indent in a logical way.

1) Use TAB when you want to show the code is arriving in a different scope,
   _never_ use TAB for further alignment

2) Use space when you want to align code within the same scope.
Collateral typo
Merge branch 'master' into copyright-2014

Conflicts:
	cget/main.c
	cherokee/main_admin.c