remove net context (#141)

Author: siddontang

.travis.yml

@@ -1,9 +1,9 @@
 language: go
 
 go:
-  - 1.6
   - 1.7
-
+  - 1.8
+  
 services:
   - elasticsearch
   - mysql

glide.lock

@@ -7,7 +7,7 @@ import:
 - package: github.com/satori/go.uuid
   version: ^1.1.0
 - package: github.com/siddontang/go-mysql
-  version: 426eb5688c9b950431673ef104deb5da8ab04648
+  version: 799150b6d0e9a3d786b015f0d77fcb3ae9c717ff
   subpackages:
   - canal
   - client

glide.yaml

@@ -1,6 +1,7 @@
 package river
 
 import (
+	"context"
 	"fmt"
 	"regexp"
 	"sync"
@@ -9,7 +10,6 @@ import (
 	"github.com/ngaut/log"
 	"github.com/siddontang/go-mysql-elasticsearch/elastic"
 	"github.com/siddontang/go-mysql/canal"
-	"golang.org/x/net/context"
 )
 
 // In Elasticsearch, river is a pluggable service within Elasticsearch pulling data then indexing it into Elasticsearch.