Added nginx configuration for LTI

bbb-lti/lti.nginx

+	 # Handle request to bbb-web running within Tomcat.  This is for
+	 # the BBB-API and Presentation.
+       location /lti {
+           proxy_pass         http://127.0.0.1:8080;
+           proxy_redirect     default;
+           proxy_set_header   X-Forwarded-For   $proxy_add_x_forwarded_for;
+
+	# Allow 30M uploaded presentation document.
+           client_max_body_size       30m;
+           client_body_buffer_size    128k;
+
+           proxy_connect_timeout      90;
+           proxy_send_timeout         90;
+           proxy_read_timeout         90;
+
+           proxy_buffer_size          4k;
+           proxy_buffers              4 32k;
+           proxy_busy_buffers_size    64k;
+           proxy_temp_file_write_size 64k;
+
+           include    fastcgi_params;
+       }