core.actions: More reliable mimetype checking @ execute_file

This is a result of https://github.com/hut/ranger/issues/43 :

adam8157:
  Hmm... I found this behavior is different between running in Debian Sid
  and Fedora 17.

  Their python version are both 2.7.3, but when you touch a file named
  foo.sh, and press "r", ranger in Fedora 17 displays bash as the first
  opener, then editor and pager, but ranger in Debian Sid displays editor
  first, then pager and bash.

[...]

hut:
  Ok, with your help I found it. Actions.execute_file and
  Actions.draw_possible_programs optimize the process by skipping the call
  to file --mimetype -Lb and using the mime type that the python mimetypes
  library found. The two methods return different mimetypes sometimes.
  Since file is more reliable than the python mimetypes library, I'll
  change it to use file always.

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