First version of README with changes to the json schema

.gitignore

@@ -0,0 +1 @@
+/.project

crawler/README.md

@@ -0,0 +1,113 @@
+# Changes to json schema
+
+Github continues to change and evolve their schema. 
+Because of this json format in which data is stored also changes.
+Here you can find information what was changed and when.
+
+
+## 2012-03-11 changes
+
+There is a lot more information about repository now.
+
+### Compatibility issues:
+
+  * **repo** key name was changed to **repository**. 
+
+### New schema example:
+
+```json
+{
+	"repository": {
+	    "homepage": "",
+	    "watchers": 2,
+	    "pushed_at": "2012/03/24 00:00:03 -0700",
+	    "url": "https://github.com/musubu/node-opds-parser",
+	    "has_downloads": true,
+	    "language": "JavaScript",
+	    "has_issues": true,
+	    "forks": 1,
+	    "fork": false,
+	    "created_at": "2012/03/19 03:47:00 -0700",
+	    "description": "OPDS Catalog Feed Parser for node",
+	    "size": 260,
+	    "private": false,
+	    "has_wiki": true,
+	    "name": "node-opds-parser",
+	    "owner": "musubu",
+	    "open_issues": 0
+	},
+	"actor_attributes": {
+	    "gravatar_id": "a4a6610eae5ab8c07f7f7c4020c83eba",
+	    "type": "User",
+	    "login": "musubu"
+	},
+	"created_at": "2012/03/24 00:00:04 -0700",
+	"public": true,
+	"actor": "musubu",
+	"payload": {
+	    "head": "f0587048e0fd62a1c5771951ed8639b2a4b9956b",
+	    "size": 1,
+	    "shas": [
+	        [
+	            "f0587048e0fd62a1c5771951ed8639b2a4b9956b",
+	            "dev@musubu.co.jp",
+	            "releasing version 0.1.3.",
+	            "Musubu Inc",
+	            true
+	        ]
+	    ],
+	    "ref": "refs/heads/master"
+	},
+	"url": "https://github.com/musubu/node-opds-parser/compare/d8d0b627a6...f0587048e0",
+	"type": "PushEvent"
+}
+```
+
+
+## 2011-03 first json schema
+
+Bellow you can find sample record from 2011-03 datasets:
+
+```json
+{
+	"repo": {
+	    "id": 991048,
+	    "url": "https://api.github.dev/repos/cbeer/blacklight_user_generated_content",
+	    "name": "cbeer/blacklight_user_generated_content"
+	},
+	"type": "PushEvent",
+	"public": true,
+	"created_at": "2011-03-01T00:00:00Z",
+	"payload": {
+	    "shas": [
+	        [
+	            "b6b9e0729643f8debf9dbd9ec3dfcab1a6b8ffcb",
+	            "chris@cbeer.info",
+	            "document filter for comments index",
+	            "Chris Beer"
+	        ],
+	        [
+	            "8ca5cf297e3b5bbdd19654ca289ede782a82ac1f",
+	            "chris@cbeer.info",
+	            "fix up comments @document instance variable",
+	            "Chris Beer"
+	        ]
+	    ],
+	    "repo": "cbeer/blacklight_user_generated_content",
+	    "actor": "cbeer",
+	    "ref": "refs/heads/master",
+	    "size": 2,
+	    "head": "8ca5cf297e3b5bbdd19654ca289ede782a82ac1f",
+	    "actor_gravatar": "604d4106c02e6e5525a7768c2f398baa",
+	    "push_id": 25733409
+	},
+	"actor": {
+	    "gravatar_id": "604d4106c02e6e5525a7768c2f398baa",
+	    "id": 111218,
+	    "url": "https://api.github.dev/users/cbeer",
+	    "avatar_url": "https://secure.gravatar.com/avatar/604d4106c02e6e5525a7768c2f398baa?",
+	    "login": "cbeer"
+	},
+	"id": "1158443437"
+}
+```