add locate support for Ubuntu
Merge pull request #97 from yemutex/master

Add spec for showing version
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Raise NotImplementedError for host OS commands

Was: ArgumentError
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Merge pull request #96 from bradleyd/issue-67

add locate support for Ubuntu
Merge branch 'master' of github.com:benjaminoakes/maid
Add @bradleyd
Add spec for locate
Shorten name: os_platform_locate -> locate
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Closes #67
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