Removed syntastic and replaced it with ale

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

sources_non_forked/ale/ale_linters/pyrex/cython.vim

@@ -0,0 +1,10 @@
+" Author: w0rp <devw0rp@gmail.com>
+" Description: cython syntax checking for cython files.
+
+call ale#linter#Define('pyrex', {
+\   'name': 'cython',
+\   'output_stream': 'stderr',
+\   'executable': 'cython',
+\   'command': 'cython --warning-extra -o ' . g:ale#util#nul_file . ' %t',
+\   'callback': 'ale#handlers#unix#HandleAsError',
+\})