json rendering support

[KeeganRoth]

JsonRenderer will create changelog.json. I've updated the README.md to reflect the new functionality. I also made some preliminary commits to pull up some functionality from SimpleHtmlRenderer to its parent FileRenderer so I didn't have to duplicate common logic between SimpleHtmlRenderer and JsonRenderer.

I have generateJSONChangeLog true by default, that isn't required. So if you think the json file shouldn't be written by default, then no argument from me.

[danielflower]

Cool! JSON is always good, so I'm fine with the default.

Can you just send me an example of a JSON file it generates? I'll add it to the sample output files, then merge this.

Thanks.

[KeeganRoth]

No problem. Thanks for the plugin to be able to add to! Below is the first several objects from that json generated by the junit run.

[
    { "id":"00619e7e4c70c23d5d84a3b37156c76b678e32b7", "message":"refactor resource loading into method in parent for re-use", "authorName":"Keegan Roth", "authorEmail":"RothKeeganJ@JohnDeere.com", "committerName":"Keegan Roth", "committerEmail":"RothKeeganJ@JohnDeere.com", "date":"2014-04-25 14:57:28 -0500", "tags":[] }
  , { "id":"d3c5ade34035df08173ca499efd32913073536cc", "message":"remove resource leak warning in FileRenderer.convertStreamToString()", "authorName":"Keegan Roth", "authorEmail":"RothKeeganJ@JohnDeere.com", "committerName":"Keegan Roth", "committerEmail":"RothKeeganJ@JohnDeere.com", "date":"2014-04-25 14:28:31 -0500", "tags":[] }
  , { "id":"bcd3b49058cfff14604121cb3e6486f94207c56f", "message":"move convertStreamToString() to parent class for re-use", "authorName":"Keegan Roth", "authorEmail":"RothKeeganJ@JohnDeere.com", "committerName":"Keegan Roth", "committerEmail":"RothKeeganJ@JohnDeere.com", "date":"2014-04-25 14:27:11 -0500", "tags":[] }
  , { "id":"f4133bc3bbd46926817388575a3babf231abbae7", "message":"Updated version to use in readme", "authorName":"Daniel Flower", "authorEmail":"git@danielflower.com", "committerName":"Daniel Flower", "committerEmail":"git@danielflower.com", "date":"2014-04-10 09:11:18 -0500", "tags":[] }
  , { "id":"32271674a0e956d1081d610e853f3a592d2cf2d0", "message":"Bumping minor version for new feature", "authorName":"Daniel Flower", "authorEmail":"git@danielflower.com", "committerName":"Daniel Flower", "committerEmail":"git@danielflower.com", "date":"2014-04-10 09:00:15 -0500", "tags":[ { "name":"maven-gitlog-plugin-1.6.0" } ] }
  , { "id":"f9a6fe0b1bc88ddff219bad2fa0826d2a75f1e32", "message":"Include example of how to use an artifact that contains additional filters", "authorName":"Ivan Martinez-Ortiz", "authorEmail":"imartinezortiz@gmail.com", "committerName":"Ivan Martinez-Ortiz", "committerEmail":"imartinezortiz@gmail.com", "date":"2014-04-07 10:46:59 -0500", "tags":[] }
]

[danielflower]

Just got back from travelling so finally got around to releasing this. Version 1.7.0 with json support should be available in the central maven repository in a few days. Thanks again for the contribution.