Add linting with eslint in NeoVim, with a few bugs.

README.md

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+# ALE - Asynchronous Lint Engine
+
+ALE (Asynchronous Lint Engine) is a plugin for providing linting in NeoVim
+and Vim 8 while you edit your text files.
+
+ALE makes use of NeoVim and Vim 8 job control functions and timers to
+run linters on the contents of text buffers and return errors as
+text is changed in Vim. This allows for displaying warnings and
+errors in files being edited in Vim before file has been saved
+back to disk.
+
+**NOTE:** This Vim plugin has been written pretty quickly so far,
+and is still in rapid development. Documentation and stable APIs will
+follow later.
+
+## Known Bugs
+
+1. Warnings are cleared when a syntax error is hit with eslint.