FreeBSD/doc b82e724 (r52885)en_US.ISO8859-1/articles/contributors contrib.committers.xml, share/pgpkeys mhorne.key pgpkeys-developers.xml

Add myself (mhorne) as a new committer

Update author/committer files and add my GPG key.

Approved by:    markj
Differential Revision:  https://reviews.freebsd.org/D19679
DeltaFile
+43-0share/pgpkeys/mhorne.key
+14-0share/xml/news.xml
+5-1en_US.ISO8859-1/articles/contributors/contrib.committers.xml
+5-0share/pgpkeys/pgpkeys-developers.xml
+3-0share/xml/authors.ent
+1-0share/pgpkeys/pgpkeys.ent
+71-16 files

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