Merge pull request #74 from yzl/master

Explicitly use environment variables to describe location of knife.rb on windows.
[HELPSPOT-14633] There may only be at most 2 interfaces in HP OPC installs
[HELPSPOT-14633] Updated to latest elrepo URL
[HELPSPOT-14633] chkconfig needs -- for options
Merge pull request #75 from opscode/sh/HELPSPOT-14633

[HELPSPOT-14633] Customer supplied updates. Verified by Support
fix some attributes
fix swaps
add warning for differences between gem_package and chef_gem resources
add application-based LWRPs (hidden in TOC, still)
add chef_gem example
|resource package_gem| not |resource gem_package|
move warning to note swaps file
updates to data bag encryption, add "Encryption Versions"
add video party (for proof)
yo dawg, yaml = version 0, json = version 1
add Encrypt-then-MAC(EtM) to bullets for version 2
more explicit comment re: disabling support for version 0 and version 1 encryption formats
clarify the encryption/encoding bullets for versions 0 and 1
version 2 is available, starting with Chef 11.6
change sentence