Support a push with multiple commits

[leewardbound]

Current project does not behave as expected:

• Create a file test.txt, commit it (commit sha aaa111), push it

• File exists on S3, logs show "creating test.txt"

• Now delete the file, commit again (sha bbb222), don't push yet

• Now make another commit (git add other-test-file.txt), commit has sha ccc333, push both commits bbb222 and ccc333

• Lambda function fires once, "new head" is seen as ccc333, but test.txt still exists on S3, along with other-test-file.txt... logs show that commit ccc333 was processed, but bbb222 was not

I tested this multiple times and was quite confused by the behavior. In reality, I first noticed it when I made a new commit bbb222 and then merged in a branch to get to sha ccc333 - I realized that the head_commit object in the github eventObj notification was only including the merged file changes, and did not include my changes from bbb222.

Expected behavior: Handler should be smart enough to iterate all commits in eventObj.commits array (which will include up to 20 commits at once... supporting a huge push with more than 20 commits will be much more involved, but just supporting 20 commits should be a good bandaid)

I have a full working fix for this, I am ready to submit a PR except I don't want to make it public until issue #5 is resolved

[spullara]

Looks like #5 has been resolved. I would love your change! Just ran into this and was about to look at fixing it when I saw your issue.

[TroyCoombs]

While we wait for the PR, here's a fix for the s3put function...
`function s3put(file, user, repo, cb){
console.log("Storing " + file.filename);

async.waterfall([
    function download(callback) {
        //call github for file contents
        console.log("downloading " + file.filename);
        var params = { user: user, repo: repo, sha: file.sha };
        github.gitdata.getBlob(params, callback);
    },
    function store(result, callback) {
        //get contents from returned object
        var blob = new Buffer(result.content, 'base64');
        var mimetype = mime.lookup(file.filename);
        var isText = (mime.charsets.lookup(mimetype) == 'UTF-8');
        if (isText) {
            blob = blob.toString('utf-8');
        }
        console.log("putting " + file.filename + " of type " + mimetype);
        var putparams = { Bucket: s3bucket, Key: file.filename, Body: blob, ContentType: mimetype };
        callback(null, putparams);
    },
    function upload(result, callback) {
        console.log('within putObject funtion.');
        s3client.putObject(result, callback);
    }
],  function done(err){...`