Holidays: Added a template for the holiday files

doc/holidays/holidays.en-US

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+###############################################################################
+# International Holiday Data provided by Holidata.net
+# http://holidata.net/en-US/2015.json
+# http://holidata.net/en-US/2016.json
+#
+# Copyright 2006 - 2016, Paul Beckingham, Federico Hernandez.
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included
+# in all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+# OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+# THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+# SOFTWARE.
+#
+# http://www.opensource.org/licenses/mit-license.php
+#
+###############################################################################
+
+define holidays:
+  en-US:
+    2016-01-01 = New Year's Day
+    2016-01-18 = Birthday of Martin Luther King, Jr.
+    2016-01-25 = Washington's Birthday
+    2016-04-18 = Patriots' Day
+    2016-05-30 = Memorial Day
+    2016-07-04 = Independence Day
+    2016-09-05 = Labor Day
+    2016-10-10 = Columbus Day
+    2016-11-11 = Veterans Day
+    2016-11-24 = Thanksgiving Day
+    2016-12-25 = Christmas Day
+