It breaks Hugo, will have to test/investigate.
Erro when building Hugo docs:
```
ERROR: 2016/08/05 11:19:23 site.go:1208: unable to process menus in site config
ERROR: 2016/08/05 11:19:23 site.go:1209: Unable to Cast map[string]interface {}{"pre":"<i class='fa fa-space-shuttle'></i>", "weight":-20, "url":"/commands/", "name":"Hugo Cmd Reference", "identifier":"commands"} of type map[string]interface {} to []interface{}
```
This reverts commit 7402856f06.
This patch updates the package used for parsing TOML content from
"github.com/BurntSushi/toml" to "github.com/pelletier/go-toml" as the
latter uses a more accepted OSS license (MIT), enabling the inclusion of
Viper or projects that depend on Viper in projects that have licensing
requirements incongruent with the license of the previous TOML package.
This patch replaces the PR https://github.com/spf13/viper/pull/208 after
discussing the matter with @spf13 and deciding to update the TOML parser
instead of making TOML build-optional.
This reverts commit 8d9577a72e.
The commit is reasonable enough, but this is a major breaking change for Hugo.
We have to figure out how to handle this before we introduce this one.
See https://github.com/spf13/hugo/issues/1129
