Cleanups per flake8 and code review

.gitignore

@@ -1,2 +1 @@
 *.coverprofile
-.extracted-examples

.travis.yml

@@ -2,8 +2,6 @@ language: go
 
 sudo: false
 
-cache: pip
-
 go:
 - 1.2.2
 - 1.3.3

cli-v1-to-v2

@@ -171,13 +171,14 @@ def _migrate_v1_imports(source):
 def _migrate_new_exit_error(source):
     return _EXIT_ERROR_RE.sub('cli.Exit', source)
 
+
 @_migrator
 def _migrate_bool_t_flag(source):
     return _BOOL_T_FLAG_RE.sub(_bool_t_flag_repl, source)
 
 
 def _bool_t_flag_repl(match):
-    return 'cli.BoolFlag{{Value: true, {}}}'.format(
+    return 'cli.BoolFlag{{Value: true,{}}}'.format(
         match.groupdict()['args']
     )