Inbox post (#22)

Inbox POST from federated servers now working for statuses and follow requests.
    Follow request client API added.
    Start work on federating outgoing messages.
    Other fixes and changes/tidying up.

internal/api/security/extraheaders.go

@@ -0,0 +1,8 @@
+package security
+
+import "github.com/gin-gonic/gin"
+
+// ExtraHeaders adds any additional required headers to the response
+func (m *Module) ExtraHeaders(c *gin.Context) {
+	c.Header("Server", "Mastodon")
+}