Fix byte-compile warnings

Fixes #115
Remove need-auth from sx-request--build-keyword-arguments
Autload sx-tab-frontpage

Affects #109
Autoload sx-tab-frontpage
Autoload sx-tab-frontpage correctly
Turn interactible objects into actual buttons

Fixes #96
Tweak section header face.
Merge pull request #119 from vermiculus/buttons

Buttons
Merge pull request #118 from vermiculus/compilation-issues

 Compilation issues
Merge branch 'master' into organize