Add HammerJS library Plugin (#3125)

* hammerjs library plugin - add readme.tid

* hammerjs library - add plugin.info

* hammerjs library plugin - add tiddlywiki.files

* hammerjs library plugin - add hammer.min.js v2.0.8 latest master

* hammerjs library plugin - add LICENSE

* change to latest hammer.js from hammerjs.github.io

as I've tested, the version from master (dated 2016-09-30) doesn't work like the latest version available from the website (https://hammerjs.github.io), dated 2016-04-23

plugins/tiddlywiki/hammerjs/files/LICENSE.markdown

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+The MIT License (MIT)
+
+Copyright (C) 2011-2017 by Jorik Tangelder (Eight Media)
+
+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.

plugins/tiddlywiki/hammerjs/files/tiddlywiki.files

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+{
+	"tiddlers": [
+		{
+			"file": "hammer.min.v2.0.8.js",
+			"fields": {
+				"type": "application/javascript",
+				"title": "$:/plugins/tiddlywiki/hammerjs/hammer.js",
+				"module-type": "library"
+			},
+			"prefix": "",
+			"suffix": ""
+		},{
+			"file": "LICENSE.markdown",
+			"fields": {
+				"type": "text/plain",
+				"title": "$:/plugins/tiddlywiki/hammerjs/license"
+			}
+		}
+	]
+}

plugins/tiddlywiki/hammerjs/plugin.info

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+{
+	"title": "$:/plugins/tiddlywiki/hammerjs",
+	"description": "HammerJS library by Jorik Tangelder (Eight Media)",
+	"author": "JeremyRuston",
+	"core-version": ">=5.0.0",
+	"list": "readme license"
+}

plugins/tiddlywiki/hammerjs/readme.tid

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+title: $:/plugins/tiddlywiki/hammerjs/readme
+
+This plugin packages [[HammerJS|https://hammerjs.github.io]] for use by other plugins. It does not provide any end-user visible features.