Fix symbolic link bug of installDirectory
#831
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if `installDirectory` is placed in a path which contains symbolic link, an exception will throw because `getCanonicalPath()` may resolve to another different path.
For example, set `installDirectory` to `${java.io.tmpdir}/nodejs` in mac os x throws exception, because `getCanonicalPath()` resolve `/var/folders/**/nodejs` to `/private/var/folders/**/nodejs`.
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if
installDirectoryis placed in a path which contains symbolic link, an exception will throw becausegetCanonicalPath()may resolve to another different path.For example, set
installDirectoryto${java.io.tmpdir}/nodejsin mac os x throws exception, becausegetCanonicalPath()resolve/var/folders/**/nodejsto/private/var/folders/**/nodejs.Summary
Tests and Documentation