Fix unicode problems with overview-by-date

bin/overview-by-date

@@ -31,6 +31,7 @@ def _get_commit_count(repo, start, end, my_email):
             '--before={}'.format(end.isoformat())]
     LOGGER.debug(" ".join(command))
     output = subprocess.check_output(command)
+    output = output.decode('utf-8')
     lines = output.split('\n')
     total = len(lines) if output else 0
     my_lines = [line for line in lines if my_email in line]
@@ -84,7 +85,8 @@ def _count_tests(repo):
     LOGGER.debug(" ".join(command))
     try:
         output = subprocess.check_output(command, stderr=subprocess.STDOUT)
-    except subprocess.CalledProcessError:
+        output = output.decode('utf-8')
+    except subprocess.CalledProcessError as e:
         LOGGER.info("Failed to call py.test for %s", repo)
         return 0
     count = 0
@@ -126,7 +128,7 @@ def main():
     #LOGGER.setLevel(logging.DEBUG)
 
     config = teamanalysis.config.get()
-    timepoint = datetime.datetime(2013, 12, 30, 0, 0, 1)
+    timepoint = datetime.datetime(2015, 8, 1, 0, 0, 1)
     now = datetime.datetime.utcnow()
     while timepoint < now + datetime.timedelta(days=7):
         _show_summary(timepoint, config['my_email'])