Rename sx-network to sx-site

According to the documentation, it's the appropriate terminology.
Merge branch 'master' into network-list

Conflicts:
	sx-site.el
Use narrow filter for site list
Merge branch 'master' into network-list
Move question sorting function to sx.el

It is not specific to questions -- it is generally applicable to any
alist.
Don't need to hexify filter
Include more fields in the sites filter
Add favorite sites customization
Convenience argument for `cache-get'

Allows for setting the cache if it does not exist.
Use smart caching
Disable font-lock-mode
Fontify when filling
Fill content!
Merge branch 'sx-question-mode' into font-lock
Comment
Font lock @usernames
Merge branch 'master' into filling-and-fontlocking
Start link implementation
Set `sx-request-api-root` to use `https` instead of `http`.

This will prevent loss of authentication token when using authentication.
Merge pull request #49 from jleechpe/sx-request-make-update

Set `sx-request-api-root` to use `https` instead of `http`.