brush up set docs
Add mappedTo to set proxy and test
Add usage notes and reassurances that they're observable
try uninstall and reinstall snockets
try old version of travis-artifacts
check for TRAVIS_PULL_REQUEST
test for both, only reinstall snockets if pushing
Merge pull request #1053 from batmanjs/travis-upload

Try to get travis upload working again
toSentence shouldn't be destructive
Merge pull request #1055 from batmanjs/fix-toSentence

toSentence shouldn't be destructive
Merge pull request #1052 from batmanjs/rm/set-docs

SetProxy::mappedTo and Set docs
update set constructor api
fix more tests
Add error in case too many arguments
test and implement Set::addArray
test and implement Set::removeArray
update docs