Add default buildIn & buildOut CSS to succession

[tejaede]

Add default values to succession.contentBuildInAnimation and succession.contentBuildInAnimation to help facilitate animation.

• Document structure of contentBuildInAnimation & succession.contentBuildInAnimation as being the standard component buildIn/Out
• Add example of succession animation to succession.info

[tejaede]

@marchant @thibaultzanini

Updated to include the documentation aspect so this is ready.

I can merge into master OR @thibaultzanini can merge into his branch if you'd rather.