Merge pull request #2493 from mattermost/plt-1840

PLT-1840 Better build system.

model/version.go

@@ -28,10 +28,10 @@ var versions = []string{
 }
 
 var CurrentVersion string = versions[0]
-var BuildNumber = "_BUILD_NUMBER_"
-var BuildDate = "_BUILD_DATE_"
-var BuildHash = "_BUILD_HASH_"
-var BuildEnterpriseReady = "_BUILD_ENTERPRISE_READY_"
+var BuildNumber string
+var BuildDate string
+var BuildHash string
+var BuildEnterpriseReady string
 var versionsWithoutHotFixes []string
 
 func init() {