Revision 1911931

This fixes #22 in Github:

Enhance hook script check-mime-type.pl to also check property-modified files.

* contrib/hook-scripts/check-mime-type.pl:
  - add option to recognize property-modified files for checks
  - make check for svn:eol-style optional
  - enhance texts and comments to reflect changes
  - rename array "files_added" to "files_to_check" to better fit its usage
  - explicitly mark here document with quotes as interpolating
  - fix script name in comments
  - update copyright and license to reflect switch to ASF

Patch by: Matthias Bücher maddes+subversion@maddes.net
Suggested by: Leo Davis [1]

[1] https://mail-archives.apache.org/mod_mbox/subversion-dev/201403.mbox/%3C1576503.m6XB7udPXQ@hurry.speechfxinc.com%3E