Removed godep dependency.

Golang community are discuting a vendor aproach to go dependencies. This
change will come as experimental in go 1.5. For now I am removing the
godep dependency manager and using a vendor aproach.

I still have to use the full path when importing dependencies, but when
go1.5 released I just have to rename the imports and use a -vendor
prefix when building the project.

ipe/app.go

@@ -10,7 +10,7 @@ import (
 	"fmt"
 	"sync"
 
-	log "github.com/golang/glog"
+	log "github.com/dimiro1/ipe/vendor/github.com/golang/glog"
 )
 
 // An App