Change behaviour of theme_update to be more like an update#1519

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hadley merged 7 commits intotidyverse:masterfrom

oneillkza:master

Feb 4, 2016

Commits on Jan 25, 2016

Change behaviour of theme_update to be more of an update, while adding theme_replace that has the same behaviour as the old theme_update. Also expanded and clarified the documentation for these.
koneill
committed
Merge remote branch 'upstream/master'
koneill
committed
Fix duplicate argument in documentation.
koneill
committed

Commits on Feb 1, 2016

Merge remote branch 'upstream/master'
koneill
committed
Minor tweaks per https://github.com/hadley/ggplot2/pull/1519#issuecomment-177631209
koneill
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Add pull request link to NEWS.md
koneill
committed

Commits on Feb 2, 2016

Add Github username to NEWS note.
koneill
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