Refactor various aspects of bot

 * Add basic validation for a new repo creation (that it matches required regex's and that it exists and accessible to bot)
 * Significantly improve logging
 * Add admin-only feature to trigger force update for specified repo
 * Update all bundled libs to their newest version

Author: Vladimir Smirnov

Gopkg.lock

@@ -69,7 +69,7 @@ type Configuration struct {
 
 var Config = Configuration{
 	AdminUsername:   "REPLACE_ME",
-	Listen:          ":8080",
+	Listen:          "127.0.0.1:8080",
 	Logger:          []zapwriter.Config{DefaultLoggerConfig},
 	DatabaseType:    "sqlite3",
 	DatabaseURL:     "./github2telegram.DB",