Add LoRaWAN Server written in Erlang

Signed-off-by: Drasko DRASKOVIC <drasko.draskovic@gmail.com>

lora/brocaar/README.md

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+## Brocaar LoRa Network Server
+Integration of Brocaar's [LoRa Network Server](https://github.com/brocaar/loraserver) written in Go.
+
+Docker images are prepared and maintained by Mainflux team.

lora/gotthardp/README.md

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+# Gottahrpd LoRaWAN Server
+Integration of gottharpd's [LoRaWAN Server](https://github.com/gotthardp/lorawan-server) written in Erlang.

lora/gotthardp/docker-compose.yml

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+###
+# Copyright (c) Mainflux
+#
+# Mainflux server is licensed under an Apache license, version 2.0 license.
+# All rights not explicitly granted in the Apache license, version 2.0 are reserved.
+# See the included LICENSE file for more details.
+###
+
+version: '2'
+
+services:
+  ###
+  # MongoDB
+  ###
+  mongo:
+    image: mongo:latest
+    ports:
+      - "27017:27017"
+      - "28017:28017"
+    container_name: mainflux-mongodb
+    command: --smallfiles --nojournal
+    networks:
+      - mainflux
+
+  ### 
+  # Redis
+  ###
+  redis:
+    image: redis:alpine
+    container_name: mainflux-redis
+    ports:
+      - "6379:6379"
+    networks:
+      - mainflux
+      - lora
+
+  ###
+  # NATS
+  ###
+  nats:
+    image: nats:latest
+    container_name: mainflux-nats
+    ports:
+      - "4222:4222"
+      - "8222:8222"
+    networks:
+      - mainflux
+
+  ###
+  # Mainflux MQTT Broker
+  ###
+  mainflux-mqtt:
+    image: mainflux/mainflux-mqtt:latest
+    container_name: mainflux-mqtt
+    ports:
+      - "1883:1883"
+    networks:
+      - mainflux
+
+  ###
+  # Mainflux Core Server
+  ###
+  mainflux-core:
+    image: mainflux/mainflux-core:latest
+    container_name: mainflux-core
+    ports:
+      - "7070:7070"
+    networks:
+      - mainflux
+
+
+  ############
+  ### LoRa ###
+  ############
+  ###
+  # LoRaWAN Gateway Bridge
+  ###
+  lorawan-server:
+    image: gotthardp/lorawan-server:latest
+    container_name: mainflux-lorawan-server
+    ports:
+      - "1680/udp:1680/udp"
+      - "8080/tcp:8080/tcp"
+    networks:
+      - lora
+
+
+networks:
+  mainflux:
+  lora: