atom: Add support for github's atom editor.

basis/editors/atom/atom.factor

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+! Copyright (C) 2014 Doug Coleman.
+! See http://factorcode.org/license.txt for BSD license.
+USING: editors kernel make math.parser namespaces sequences ;
+IN: editors.atom
+
+SINGLETON: atom-editor
+atom-editor \ editor-class set-global
+
+SYMBOL: atom-path
+
+M: atom-editor editor-command ( file line -- command )
+    [
+        atom-path get "atom" or ,
+        number>string ":" glue ,
+    ] { } make ;
+

basis/editors/atom/authors.txt

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+Doug Coleman

basis/editors/atom/summary.txt

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+Atom editor integration

basis/editors/atom/tags.txt

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+not loaded