Fleshed out aliases section, loading the "redirect" keyword so that it's easier to find. Specifically added a "how aliases work" section.
Added Discourse to comments section.
Fleshed out themes/customizing, because it seems to be the source of a lot of questions on the forum.
* Add meta author, description and generator tags
* Add Hugo version beside the logo and in the footer
* Suggest the user to run `go get -u -v` to update dependencies
* Requires Go 1.3+ rather than Go 1.1+
* Improve rendering/formatting in some places
* Add trailing slash to URLs where appropriate
* GitHub redirects all http requests to https, update accordingly
* Add link to https://travis-ci.org/spf13/hugo
* Correct heading levels in docs/content/community/mailing-list.md
* Mention RFC 3339 as the `date` format set by `hugo new`
* Mention that `hugo new` does not add `draft = true` when the user
provides an archetype
* List short examples of TOML and YAML side by side
* Compact the Math template functions into a table
* Put some notes into a blockquote
Among the various changes, most instances of
{{ template "partials/FILE.html" . }}
were changed to
{{ partial "FILE.html" . }}
Also, in main.go, change "2013" to "2013-14".
