refactor(library/data/set): expand set.lean to set directory

library/data/data.md

@@ -23,5 +23,5 @@ Constructors:
 * [subtype](subtype.lean)
 * [quotient](quotient/quotient.md)
 * [list](list/list.md)
-* [set](set.lean)
+* [set](set/set.md)
 * [vector](vector.lean)

library/data/default.lean

@@ -1,6 +1,9 @@
---- Copyright (c) 2014 Microsoft Corporation. All rights reserved.
---- Released under Apache 2.0 license as described in the file LICENSE.
---- Author: Jeremy Avigad
+/-
+Copyright (c) 2014 Microsoft Corporation. All rights reserved.
+Released under Apache 2.0 license as described in the file LICENSE.
 
+Module: data.default
+Author: Jeremy Avigad
+-/
 import .empty .unit .bool .num .string .nat .int
 import .prod .sum .sigma .option .subtype .quotient .list .set

library/data/set/basic.lean

@@ -2,7 +2,7 @@
 Copyright (c) 2014 Jeremy Avigad. All rights reserved.
 Released under Apache 2.0 license as described in the file LICENSE.
 
-Module: data.set
+Module: data.set.basic
 Author: Jeremy Avigad, Leonardo de Moura
 -/
 import logic

library/data/set/default.lean

@@ -0,0 +1,8 @@
+/-
+Copyright (c) 2014 Jeremy Avigad. All rights reserved.
+Released under Apache 2.0 license as described in the file LICENSE.
+
+Module: data.set.default
+Author: Jeremy Avigad
+-/
+import .basic

library/data/set/set.md

@@ -0,0 +1,6 @@
+data.set
+========
+
+Subsets of an arbitrary type.
+
+* [basic](basic.lean)