Ensure that `.bin` files maintain executable bits in Windows bundles.
Ensure that `.bin` files maintain executable bits in Windows bundles.

Windows has no concept of the executable bit so it is not applied by the
`fstream` `Reader` when building the tarball which is used in both
`meteor build` and `meteor deploy`.  For Windows users, this causes
important scripts (such as `node-pre-gyp`) to not be executable when
the bundles are deployed to Unix platforms (such as Galaxy).

To avoid giving every file executable bits, this applies an executable
bit to the file only if it has read permission (something Windows _is_
aware of) and if it is in a location that Node bin links are typically
placed, the `/node_modules/.bin/` directories.

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