Rewrite as Python 3 compatible

Author: mrfyda

setup.py

@@ -34,7 +34,7 @@
 
         'License :: OSI Approved :: MIT License',
 
-        'Programming Language :: Python :: 2',
+        'Programming Language :: Python :: 2.7',
         'Programming Language :: Python :: 3',
     ],
 

src/codacy/__init__.py

@@ -1,4 +1,5 @@
-import reporter
+from __future__ import absolute_import
+from . import reporter
 
 
 def main():

src/codacy/reporter.py

@@ -72,7 +72,7 @@ def percent(s):
         'fileReports': [],
     }
 
-    sources = map(lambda x: x.firstChild.nodeValue, report_xml.getElementsByTagName('source'))
+    sources = [x.firstChild.nodeValue for x in report_xml.getElementsByTagName('source')]
     classes = report_xml.getElementsByTagName('class')
     for cls in classes:
         file_report = {