Removed syntastic and replaced it with ale

Read more here:
https://github.com/w0rp/ale

sources_non_forked/ale/ale_linters/python/mypy.vim

@@ -0,0 +1,71 @@
+" Author: Keith Smiley <k@keith.so>, w0rp <devw0rp@gmail.com>
+" Description: mypy support for optional python typechecking
+
+call ale#Set('python_mypy_executable', 'mypy')
+call ale#Set('python_mypy_ignore_invalid_syntax', 0)
+call ale#Set('python_mypy_options', '')
+call ale#Set('python_mypy_use_global', 0)
+
+function! ale_linters#python#mypy#GetExecutable(buffer) abort
+    return ale#python#FindExecutable(a:buffer, 'python_mypy', ['mypy'])
+endfunction
+
+" The directory to change to before running mypy
+function! s:GetDir(buffer) abort
+    let l:project_root = ale#python#FindProjectRoot(a:buffer)
+
+    return !empty(l:project_root)
+    \   ? l:project_root
+    \   : expand('#' . a:buffer . ':p:h')
+endfunction
+
+function! ale_linters#python#mypy#GetCommand(buffer) abort
+    let l:dir = s:GetDir(a:buffer)
+    let l:executable = ale_linters#python#mypy#GetExecutable(a:buffer)
+
+    " We have to always switch to an explicit directory for a command so
+    " we can know with certainty the base path for the 'filename' keys below.
+    return ale#path#CdString(l:dir)
+    \   . ale#Escape(l:executable)
+    \   . ' --show-column-numbers '
+    \   . ale#Var(a:buffer, 'python_mypy_options')
+    \   . ' --shadow-file %s %t %s'
+endfunction
+
+function! ale_linters#python#mypy#Handle(buffer, lines) abort
+    let l:dir = s:GetDir(a:buffer)
+    " Look for lines like the following:
+    "
+    " file.py:4: error: No library stub file for module 'django.db'
+    "
+    " Lines like these should be ignored below:
+    "
+    " file.py:4: note: (Stub files are from https://github.com/python/typeshed)
+    let l:pattern = '\v^([a-zA-Z]?:?[^:]+):(\d+):?(\d+)?: (error|warning): (.+)$'
+    let l:output = []
+
+    for l:match in ale#util#GetMatches(a:lines, l:pattern)
+        " Skip invalid syntax errors if the option is on.
+        if l:match[5] is# 'invalid syntax'
+        \&& ale#Var(a:buffer, 'python_mypy_ignore_invalid_syntax')
+            continue
+        endif
+
+        call add(l:output, {
+        \   'filename': ale#path#GetAbsPath(l:dir, l:match[1]),
+        \   'lnum': l:match[2] + 0,
+        \   'col': l:match[3] + 0,
+        \   'type': l:match[4] is# 'error' ? 'E' : 'W',
+        \   'text': l:match[5],
+        \})
+    endfor
+
+    return l:output
+endfunction
+
+call ale#linter#Define('python', {
+\   'name': 'mypy',
+\   'executable_callback': 'ale_linters#python#mypy#GetExecutable',
+\   'command_callback': 'ale_linters#python#mypy#GetCommand',
+\   'callback': 'ale_linters#python#mypy#Handle',
+\})