Updated version number to 1.1.1-SNAPSHOT
fix missing separator in multiply error message
Merge branch 'master' into develop
Merge pull request #234 from andy0130tw/develop

Missing separator in error message when multiplying
Updated history
Fixed #236: BigNumber downgrading to Number for a negative base in `pow`
Updated history
check whether the search is a property in help function
modify test corresponding to the previous commit
Fixed #238: Unit divided by Number returning zero
Merge branch 'develop' of https://github.com/josdejong/mathjs into upstream-dev
Merge pull request #239 from andy0130tw/upstream-dev

check whether the search is a property in help function
Merge branch 'master' into develop
Released version 1.1.1