Commits on Sep 1, 2018

1. Make sure files are readable when traversing source files. …

   Mill was trying to read all files found under the source directory to
   create a digest for each of them. This was causing an error for broken
   symlinks.
   
   At first I believed temporary files should be ignored to avoid this problem,
   and asked at the gitter channel how to go about this, but overriding the `sources`
   task as [suggested](https://gitter.im/lihaoyi/mill?at=5ad6cd801130fe3d36eb7655)
   by @lihaoyi didn't actually help.
   
   on a simple scala project, editing a file with Emacs, creates a link file, like:
   
   ```
   vic@oeiuwq ~/h/foo> ls -la foo/src/
   total 8
   drwxr-xr-x  4 vic  staff  128 Sep  1 12:23 .
   lrwxr-xr-x  1 vic  staff   22 Sep  1 12:23 .#hello.scala -> vic@oeiuwq.local.10748
   drwxr-xr-x  3 vic  staff   96 Sep  1 12:22 ..
   -rw-r--r--  1 vic  staff   12 Sep  1 12:22 hello.scala
   ```
   
   So this patch only makes sures that the files (or the symlink here) is actually
   readable before trying to digest it.
   
   Fixes com-lihaoyi#402

   

   vic committed Sep 1, 2018
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