trees: create trees group

Signed-off-by: Alexandre Terrasa <alexandre@moz-code.org>

diff --git a/lib/trees/trees.nit b/lib/trees/trees.nit
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+++ b/lib/trees/trees.nit
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+# This file is part of NIT ( http://www.nitlanguage.org ).
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# General module for tree data structures
+module trees
+
+import abstract_tree
+import bintree
+import rbtree