cleaned up timeline.css: changed line endings from CRLF to LF; sorted all declarations alphabetically (but kept the rule order); lowercased all property values
added box-sizing: border-box where necessary
resynced fork with upstream/master (merged timeline.css changes from pull request 207)
Merge pull request #211 from jeroenvangorkum/border-box

timeline: changed dimensioning from content-box to border-box (fix for issue 128)