Add a advanced example

It uses its own API which I packed between MTApi5 and MatLab.
Possible that this is useless, but errors from the .NET assembly are more tradable.

Examples/MatLab/AdvancedExample/Slack/private/http_paramsToString.m

@@ -0,0 +1,62 @@
+function [str,header] = http_paramsToString(params,encodeOption)
+%http_paramsToString Creates string for a POST or GET requests
+%
+%   [queryString,header] = http_paramsToString(params, *encodeOption)
+%
+%   INPUTS
+%   =======================================================================
+%   params: cell array of property/value pairs
+%           NOTE: If the input is in a 2 column matrix, then first column
+%           entries are properties and the second column entries are
+%           values, however this is NOT necessary (generally linear)
+%   encodeOption: (default 1)
+%           1 - the typical URL encoding scheme (Java call)
+%               
+%   OUTPUTS
+%   =======================================================================
+%   queryString: querystring to add onto URL (LACKS "?", see example)
+%   header     : the header that should be attached for post requests when
+%                using urlread2
+%
+%   EXAMPLE:
+%   ==============================================================
+%   params = {'cmd' 'search' 'db' 'pubmed' 'term' 'wtf batman'};
+%   queryString = http_paramsToString(params);
+%   queryString => cmd=search&db=pubmed&term=wtf+batman
+%
+%   IMPORTANT: This function does not filter parameters, sort them,
+%   or remove empty inputs (if necessary), this must be done before hand
+
+if ~exist('encodeOption','var')
+    encodeOption = 1;
+end
+
+if size(params,2) == 2 && size(params,1) > 1
+    params = params';
+    params = params(:);
+end
+
+str = '';
+for i=1:2:length(params)
+    if (i == 1), separator = ''; else separator = '&'; end
+    switch encodeOption
+        case 1
+            param  = urlencode(params{i});
+            value  = urlencode(params{i+1});
+%         case 2
+%             param    = oauth.percentEncodeString(params{i});
+%             value    = oauth.percentEncodeString(params{i+1});
+%               header = http_getContentTypeHeader(1);
+        otherwise
+            error('Case not used')
+    end
+    str = [str separator param '=' value]; %#ok<AGROW>
+end
+
+switch encodeOption
+    case 1
+        header = http_createHeader('Content-Type','application/x-www-form-urlencoded');
+end
+
+
+end