config tests added,

titles tests added,
.env file support added with dotenv,
README.md file updated for .evn file support,
database lost connection bug crash fixed,
session server run_session long timeout bug fixed,
links module added,
webrtc_proc json arguments added,
app_proc stdout and stderr support added,
infinity app_proc spawn freeze bug fixed

tests/config.js

@@ -0,0 +1,69 @@
+var config = require('../config')
+
+const not_valid = (message) => {
+    console.error('not valid (config.js): ', message)
+}
+
+const test_config = () => {
+    var config_pass = true
+
+    if (!config) {
+        not_valid('config')
+        config_pass = false
+    }
+
+    if (!config.port) {
+        not_valid('port')
+        config_pass = false
+    }
+
+    if (!config.external_domain) {
+        not_valid('external_domain')
+        config_pass = false
+    }
+
+    if (!config.coordinator_url) {
+        not_valid('coordinator_url')
+        config_pass = false
+    }
+
+    if (!config.database_url) {
+        not_valid('database_url')
+        config_pass = false
+    }
+
+    if (!config.database_name) {
+        not_valid('database_name')
+        config_pass = false
+    }
+
+    if (!config.webrtc_port_begin) {
+        not_valid('webrtc_port_begin')
+        config_pass = false
+    }
+
+    if (!config.session_limit) {
+        not_valid('session_limit')
+        config_pass = false
+    }
+
+    if (!config.log_path) {
+        not_valid('log_path')
+        config_pass = false
+    }
+
+    if (!config.webrtc_server_path) {
+        not_valid('webrtc_server_path')
+        config_pass = false
+    }
+
+    if (!config.app_args) {
+        not_valid('webrtc_server_path')
+        config_pass = false
+    }
+    return config_pass
+}
+
+module.exports = {
+    test_config
+}

tests/titles.js

@@ -0,0 +1,24 @@
+const fs = require('fs')
+
+const titles = require('../titles')
+
+const path_not_exists = (message) => {
+    console.error('path not exists (titles.json): \n', message)
+}
+
+const test_titles = () => {
+    var titles_pass = true
+
+    titles.forEach(title => {
+        if (!fs.existsSync(title.path)) {
+            titles_pass = false
+            path_not_exists(`\ttitle: ${title.title}, path: ${title.path}`)
+        }
+    })
+
+    return titles_pass
+}
+
+module.exports = {
+    test_titles
+}