[WIP] progress bar in infoBox#135

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dmpe wants to merge 6 commits intorstudio:mainfrom

Commits on Mar 3, 2016

Merge pull request #1 from rstudio/master
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Commits on Mar 19, 2016

Commits on Mar 20, 2016

code after editing a message in the PR.
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Commits on Mar 22, 2016

update after wch comments
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Commits on Mar 28, 2016

second time addressing wch comments
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