add note on app.config
edited failure recovery document to point to Renaming a Node document when a recovered cluster requires renaming of nodes.
added renaming nodes from backup in the renaming nodes document
corrections to 2I question in faq
some formatting fixes
file stub
finish up theory doc
add note to rolling upgrades doc
change doc version
remove references to old URL format
Remove duplicated sysctl settings

The settings duplicated in the leveldb doc had one error. Best to not
duplicate them at all.
Added Riak 2.0 docs for disterl port limit

Made small cleanups and added the section for riak.conf settings used to
limit the range of ports available to disterl.  Removed note about epmd
after verifying that it was unnecessary
Used config filetypes for source code sections
Merge pull request #1046 from basho/fix-dup-sysctl-settings

Remove duplicated sysctl settings
Merge pull request #1040 from basho/bugs/lp/old-url-format

Ready: Remove references to old URL format
fix anchors in list items problem
More prominently indicate that pb_backlog should be increased

It is a frequent customer issue to find that `pb_backlog` has not been
increased in a Riak CS installation. The additional wording should more
clearly indicate that the default, commented-out value actually sets it
to `5` and thus it should be increased.

Fixes #1033
Tweak thanks @lucperkins
file stub
add theory doc