Add Schema definition

This is what I think we need so far for the API. 
User authentiacation will be handled through django. 
Currently there are no secondary keys defined, though this may change in the future

Schema

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+gama.io API
+
+Schema 1 PSQL:
+
+Table api_owners - Users who own any number of API Apps, linked to specific django user:
+cols: id, name, email, user_id
+	id - int, ai
+	name - char, name of the user
+	email - char, email address of the user
+	user_id - m2o SK users.id, user id of django user
+
+Table api_apps - The Application that will be using the API:
+cols: id, apikey, name, description, owner_id, callback_uri, website, settings
+	id - int, ai
+	apikey - char (256)
+	name - char, name of the application
+	description - char, short description
+	owner_id - m2o SK api_owners.id, owner of the application
+	callback_uri - char, optional, where to send results of polling in JSON format. If unset, the device has to check in with the API. If set, the API can check in with the device (via heartbeats) as well as the device checking in with the API
+	website - char, optional, website describing the project
+	settings - text json, can turn on/off sensors, GPS_polling frequency, heartbeat frequency, etc
+
+api_heartbeat - The API will send heartbeat commands if enabled in api_apps.settings and callback_uri is valid and accepting JSON requests:
+cols: id, api_id, time_sent, time_rcvd, latency, data
+	id - int, ai
+	api_id - o2m SK api_apps.id
+	time_sent - datetime, the unix timestamp the server sends the heartbeat ping (preferably kept in check with GPS or other high accuraacy RTC)
+	time_rcvd - datetime, the unix timestamp the server receives the response
+	latency - long, the number of ms between time_sent and time_rcvd
+	data - text json, data that the API sends to the device. This can be used to apply settings immedietly or trigger events in the device

blank_db.sql

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+-- Schema Version 1
+
+CREATE TABLE api_owners (
+	id serial PRIMARY KEY,
+	name varchar (512) NOT NULL,
+	email varchar (256) NOT NULL,
+	user_id int NOT NULL
+);
+
+CREATE TABLE api_apps (
+	id serial PRIMARY KEY,
+	owner_id int NOT NULL,
+	apikey varchar (256) NOT NULL,
+	name varchar (512) NOT NULL,
+	description varchar (2048),
+	website varchar (3000),
+	callback_uri varchar (3000),
+	settings text
+);
+
+CREATE TABLE api_heartbeat (
+	id serial PRIMARY KEY,
+	api_id int NOT NULL,
+	time_sent bigint NOT NULL,
+	time_rcvd bigint NOT NULL,
+	latency numeric (6, 2) NOT NULL,
+	data text
+);