Resolved compile-time errors since merging from v1

runtests

@@ -1,7 +1,8 @@
 #!/usr/bin/env python
-from __future__ import print_function
+from __future__ import print_function, unicode_literals
 
 import argparse
+import codecs
 import glob
 import os
 import platform
@@ -37,7 +38,7 @@ def _target(func):
 
 @_target
 def _test():
-    if check_output('go version'.split()).split()[2] < 'go1.2':
+    if _go_version() < 'go1.2':
         _run('go test -v .')
         return
 
@@ -61,7 +62,7 @@ def _test():
 
 @_target
 def _gfmrun():
-    go_version = check_output('go version'.split()).split()[2]
+    go_version = _go_version()
     if go_version < 'go1.3':
         print('runtests: skip on {}'.format(go_version), file=sys.stderr)
         return
@@ -75,7 +76,7 @@ def _vet():
 
 @_target
 def _migrations():
-    go_version = check_output('go version'.split()).split()[2]
+    go_version = _go_version()
     if go_version < 'go1.3':
         print('runtests: skip on {}'.format(go_version), file=sys.stderr)
         return
@@ -115,7 +116,7 @@ def _toc():
 
 @_target
 def _gen():
-    go_version = check_output('go version'.split()).split()[2]
+    go_version = _go_version()
     if go_version < 'go1.5':
         print('runtests: skip on {}'.format(go_version), file=sys.stderr)
         return
@@ -133,26 +134,30 @@ def _run(command):
 
 
 def _gfmrun_count():
-    with open('README.md') as infile:
+    with codecs.open('README.md', 'r', 'utf-8') as infile:
         lines = infile.read().splitlines()
-        return len(filter(_is_go_runnable, lines))
+        return len(list(filter(_is_go_runnable, lines)))
 
 
 def _is_go_runnable(line):
     return line.startswith('package main')
 
 
+def _go_version():
+    return check_output('go version'.split()).decode('utf-8').split()[2]
+
+
 def _combine_coverprofiles(coverprofiles):
     combined = tempfile.NamedTemporaryFile(
         suffix='.coverprofile', delete=False
     )
-    combined.write('mode: set\n')
+    combined.write(b'mode: set\n')
 
     for coverprofile in coverprofiles:
-        with open(coverprofile, 'r') as infile:
+        with codecs.open(coverprofile, 'r', 'utf-8') as infile:
             for line in infile.readlines():
                 if not line.startswith('mode: '):
-                    combined.write(line)
+                    combined.write(line.encode('utf-8'))
 
     combined.flush()
     name = combined.name