Auto merge of #3241 - bstaletic:flakes, r=Valloric

[READY] Run flake8 on scripts in root

See https://github.com/Valloric/ycmd/pull/1135 for reference.

<!-- Reviewable:start -->
---
This change is [<img src="https://reviewable.io/review_button.svg" height="34" align="absmiddle" alt="Reviewable"/>](https://reviewable.io/reviews/valloric/youcompleteme/3241)
<!-- Reviewable:end -->

ci/appveyor/appveyor_install.bat

@@ -18,5 +18,6 @@ python --version
 
 appveyor DownloadFile https://bootstrap.pypa.io/get-pip.py
 python get-pip.py
+del get-pip.py
 pip install -r python\test_requirements.txt
 if %errorlevel% neq 0 exit /b %errorlevel%

install.py

@@ -47,5 +47,6 @@ def Main():
   for lib in old_libs:
     os.remove( lib )
 
+
 if __name__ == "__main__":
   Main()

run_tests.py

@@ -3,6 +3,7 @@
 import os
 import subprocess
 import os.path as p
+import glob
 import sys
 
 DIR_OF_THIS_SCRIPT = p.dirname( p.abspath( __file__ ) )
@@ -37,9 +38,13 @@ import argparse
 
 def RunFlake8():
   print( 'Running flake8' )
-  subprocess.check_call( [
-    sys.executable, '-m', 'flake8', p.join( DIR_OF_THIS_SCRIPT, 'python' )
-  ] )
+  args = [ sys.executable,
+           '-m',
+           'flake8',
+           p.join( DIR_OF_THIS_SCRIPT, 'python' ) ]
+  root_dir_scripts = glob.glob( p.join( DIR_OF_THIS_SCRIPT, '*.py' ) )
+  args.extend( root_dir_scripts )
+  subprocess.check_call( args )
 
 
 def ParseArguments():
@@ -93,5 +98,6 @@ def Main():
   BuildYcmdLibs( parsed_args )
   NoseTests( parsed_args, nosetests_args )
 
+
 if __name__ == "__main__":
   Main()