launcher scripts / deprecate mail param / increase RSA key size

[Joanguitar]

RSA key length set to 2048 to avoid "low security" error messages in some devices such as Raspberry Pi's. Also included main.py to launch a HiveMind server. Can be called like: HiveMind-server and accepts the flags --port PORT to define the listening port and --name NAME --access_key ACCESS_KEY --crypto_key CRYPTO_KEY --mail MAIL to define a new user in the users database before running the server. When defining a new user, only --name and --access_key are required.

[JarbasAl]

if you are adding scripts see the initial ideas in https://github.com/JarbasHiveMind/HiveMind-core/issues/16 https://github.com/JarbasHiveMind/HiveMind-core/issues/17 and https://github.com/JarbasHiveMind/HiveMind-core/issues/18