Be more like a library to support mobile (#247)

config.go

@@ -1,6 +1,7 @@
 package nebula
 
 import (
+	"errors"
 	"fmt"
 	"github.com/imdario/mergo"
 	"github.com/sirupsen/logrus"
@@ -56,6 +57,13 @@ func (c *Config) Load(path string) error {
 	return nil
 }
 
+func (c *Config) LoadString(raw string) error {
+	if raw == "" {
+		return errors.New("Empty configuration")
+	}
+	return c.parseRaw([]byte(raw))
+}
+
 // RegisterReloadCallback stores a function to be called when a config reload is triggered. The functions registered
 // here should decide if they need to make a change to the current process before making the change. HasChanged can be
 // used to help decide if a change is necessary.
@@ -407,6 +415,18 @@ func (c *Config) addFile(path string, direct bool) error {
 	return nil
 }
 
+func (c *Config) parseRaw(b []byte) error {
+	var m map[interface{}]interface{}
+
+	err := yaml.Unmarshal(b, &m)
+	if err != nil {
+		return err
+	}
+
+	c.Settings = m
+	return nil
+}
+
 func (c *Config) parse() error {
 	var m map[interface{}]interface{}