Enables mssql support (#383)

* Enables mssql support

Port of dlobs work in gogs.
Enables options in index.js
Enables MSSQL as a database option in go.
Sets ID to 0 on initial migration. Required for
MSSQL insert statements.

Signed-off-by: Beau Trepp <beautrepp@gmail.com>

* Vendors in denisenkom/go-mssqldb

Includes golang.org/x/crypto/md4
as this is required by go-msssqldb

Signed-off-by: Beau Trepp <beautrepp@gmail.com>

vendor/github.com/denisenkom/go-mssqldb/mssql_go1.3pre.go

@@ -0,0 +1,11 @@
+// +build !go1.3
+
+package mssql
+
+import (
+	"net"
+)
+
+func createDialer(p *connectParams) *net.Dialer {
+	return &net.Dialer{Timeout: p.dial_timeout}
+}