Improved python2 compatibility

Signed-off-by: Domenico Iezzi <domenico.iezzi.201@gmail.com>

.travis.yml

@@ -1,4 +1,6 @@
 language: python
-python: '3.6'
+python:
+  -  "2.7"
+  -  "3.5"
 install: pip install .
 script: python test.py

README.md

@@ -1,8 +1,8 @@
-# Google play python3 API [![Build Status](https://travis-ci.org/NoMore201/googleplay-api.svg?branch=master)](https://travis-ci.org/NoMore201/googleplay-api)
+# Google play python API [![Build Status](https://travis-ci.org/NoMore201/googleplay-api.svg?branch=master)](https://travis-ci.org/NoMore201/googleplay-api)
 
 This project contains an unofficial API for google play interactions. The code mainly comes from
-[GooglePlayAPI project](https://github.com/egirault/googleplay-api/) which was written for python2 and it's not
-maintained anymore. The code was ported to python3 with some important changes:
+[GooglePlayAPI project](https://github.com/egirault/googleplay-api/) which is not
+maintained anymore. The code was updated with some important changes:
 
 * ac2dm authentication with checkin and device info upload
 * updated search and download calls

gpapi/config.py

@@ -1,7 +1,13 @@
 from . import googleplay_pb2
 import time
 import os
-import configparser
+import sys
+
+VERSION = sys.version_info[0]
+if VERSION == 2:
+    import ConfigParser
+else:
+    import configparser
 
 # separator used by search.py, categories.py, ...
 SEPARATOR = ";"
@@ -13,7 +19,11 @@ GOOGLE_PUBKEY   = "AAAAgMom/1a/v0lblO2Ubrt60J2gcuXSljGFQXgcyZWveWLEwo6prwgi3iJIZ
 # if you want to add another phone, just create another section in
 # the file. Some configurations for common phones can be found here:
 # https://github.com/yeriomin/play-store-api/tree/master/src/main/resources
-config = configparser.ConfigParser()
+if VERSION == 2:
+    config = ConfigParser.ConfigParser()
+else:
+    config = configparser.ConfigParser()
+
 filepath = os.path.join( os.path.dirname( os.path.realpath(__file__) ), 'device.properties')
 config.read(filepath)
 device = {}

gpapi/utils.py

@@ -1,4 +1,7 @@
 import struct
+import sys
+
+VERSION = sys.version_info[0]
 
 def fromDocToDictionary(app):
     return {
@@ -65,6 +68,9 @@ def toBigInt(byteArray):
     array = byteArray[::-1] # reverse array
     out = 0
     for key, value in enumerate(array):
+        if VERSION == 3:
             decoded = struct.unpack("B", bytes([value]))[0]
+        else:
+            decoded = struct.unpack("B", value)[0]
         out = out | decoded << key*8
     return out