Add basic tests, fixes #18 and fixes #7

.travis.yml

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+script: ./tests.py

tests.py

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+#!/usr/bin/env python3
+import json
+import os
+import sys
+
+REQUIRED_FIELDS = ['publicKey', 'password', 'contact']
+
+
+RED = '\033[91m'
+GREEN = '\033[92m'
+YELLOW = '\033[93m'
+LIGHT_PURPLE = '\033[94m'
+PURPLE = '\033[95m'
+END = '\033[0m'
+
+
+def validate(path):
+    print("Validating %s" % path)
+    try:
+        creds = open(path).read()
+        peers = json.loads("{%s}" % creds)
+        hosts = peers.keys()
+        for host in hosts:
+            for field in REQUIRED_FIELDS:
+                if not field in peers[host]:
+                    print("    %sHost %s is missing the %s field!%s" % (RED, host, field, END))
+                    return False
+        print("    %sSuccess!%s" % (GREEN, END))
+        return True
+    except ValueError:
+        print("    %sInvalid JSON!%s" % (RED, END))
+        return False
+
+success = True
+for directory, subdirs, files in os.walk('.'):
+    if len(files) > 0:
+        for f in files:
+            if f.endswith('.k'):
+                result = validate("%s/%s" % (directory, f))
+                if not result:
+                    success = False
+if not success:
+    sys.exit(1)