Continue #25: Parse csv into array

As of this commit, the imported file is sitting in a JS array in the
browser.  We still need to check the SSN against the API for duplicates,
and to POST each non-duplicate record via the API.

I've done some of the parsing inside the controller, which may be bad
form.  I just split the csv so that the headers and footers aren't sent
back to the browser.  Then, in the client-client (as we're calling it),
I use the MIT-licensed "PapaParse" library to transform the csv lines
into a JS array.

I also fixed a call in index.jade so that it refers to PapaParse instead
of to a different jquery library that I decided not to use.

I added papaparse.js so that we could use the library.  It has a license
header and I don't think we need any other files from that repo.  They
do offer a minified version, if we prefer.

app/controllers/core.server.controller.js

@@ -4,7 +4,6 @@
  * Module dependencies.
  */
 exports.index = function(req, res) {
-    var qs = require('querystring');
     if (req.method == "POST"){
         var body = '';
         req.on('data', function (data) {
@@ -17,8 +16,13 @@ exports.index = function(req, res) {
             // naming this "file_data" because I assume that we will
             // only be POST-ing imported files.  This may change in the
             // future.
-            var file_data = qs.parse(body);
-            res.send(file_data);
+
+            // split out the contents from the headers
+            var csv_body = body.split("Content-Type: text/csv\r\n\r\n");
+            // and from the footers
+            var csv_only = csv_body[1].split("\r\n\r\n-----------------------------");
+            var csv_contents = csv_only[0];
+            res.send(csv_contents);
         });
     }
     else{

app/views/index.jade

@@ -17,7 +17,7 @@ html(lang="en")
     script(type='text/javascript', src='js/lib/FileSaver.js/FileSaver.min.js')
     script(type='text/javascript', src='js/lib/Blob.js/Blob.min.js')
     script(type='text/javascript', src='js/lib/sampleData.js')
-    script(type='text/javascript', src='js/jquery.csv.js')
+    script(type='text/javascript', src='js/papaparse.js')
     script(type='text/javascript', src='js/index.js')
 
   body

public/js/index.js

@@ -522,6 +522,7 @@ $(function() {
 
     function importAll() {
         // get file
+        // need to check to make sure that it is a csv file, here
         var formData = new FormData();
         formData.append('file', $('input[type=file]')[0].files[0]);
         $.ajax("/upload", {
@@ -530,12 +531,14 @@ $(function() {
             processData: false,
             contentType: false
         }).done(function(response) {
-            console.log(response);
             // read each line of file
+            var result = Papa.parse(response);
+            console.log("DEBUG: " + result);
+            // loop through array
             // for each line, check whether ssn exists via API
-            // if it does, put that line in a list of duplicates
-            // if it doesn't, POST that line to the API
-            // display any duplicates to the user
+            // if it does, put that record in a list of possible duplicates
+            // if it doesn't, POST that record to the API
+            // display the list of possible duplicates to the user
         });
     }