Removed syntastic and replaced it with ale

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

sources_non_forked/ale/ale_linters/python/pycodestyle.vim

@@ -0,0 +1,63 @@
+" Author: Michael Thiesen <micthiesen@gmail.com>
+" Description: pycodestyle linting for python files
+
+call ale#Set('python_pycodestyle_executable', 'pycodestyle')
+call ale#Set('python_pycodestyle_options', '')
+call ale#Set('python_pycodestyle_use_global', 0)
+
+function! ale_linters#python#pycodestyle#GetExecutable(buffer) abort
+    return ale#python#FindExecutable(a:buffer, 'python_pycodestyle', ['pycodestyle'])
+endfunction
+
+function! ale_linters#python#pycodestyle#GetCommand(buffer) abort
+    return ale#Escape(ale_linters#python#pycodestyle#GetExecutable(a:buffer))
+    \   . ' '
+    \   . ale#Var(a:buffer, 'python_pycodestyle_options')
+    \   . ' -'
+endfunction
+
+function! ale_linters#python#pycodestyle#Handle(buffer, lines) abort
+    let l:pattern = '\v^(\S*):(\d*):(\d*): ([EW]\d+) (.*)$'
+    let l:output = []
+
+    " lines are formatted as follows:
+    " file.py:21:26: W291 trailing whitespace
+    for l:match in ale#util#GetMatches(a:lines, l:pattern)
+        if(l:match[4] is# 'W291' || l:match[4] is# 'W293')
+        \&& !ale#Var(a:buffer, 'warn_about_trailing_whitespace')
+            " Skip warnings for trailing whitespace if the option is off.
+            continue
+        endif
+
+        if l:match[4] is# 'W391'
+        \&& !ale#Var(a:buffer, 'warn_about_trailing_blank_lines')
+            " Skip warnings for trailing blank lines if the option is off
+            continue
+        endif
+
+        let l:item = {
+        \   'lnum': l:match[2] + 0,
+        \   'col': l:match[3] + 0,
+        \   'type': l:match[4][0],
+        \   'sub_type': 'style',
+        \   'text': l:match[5],
+        \   'code': l:match[4],
+        \}
+
+        " E999 and E112 are syntax errors.
+        if l:match[4] is# 'E999' || l:match[4] is# 'E112'
+            unlet l:item.sub_type
+        endif
+
+        call add(l:output, l:item)
+    endfor
+
+    return l:output
+endfunction
+
+call ale#linter#Define('python', {
+\   'name': 'pycodestyle',
+\   'executable_callback': 'ale_linters#python#pycodestyle#GetExecutable',
+\   'command_callback': 'ale_linters#python#pycodestyle#GetCommand',
+\   'callback': 'ale_linters#python#pycodestyle#Handle',
+\})