ignore all dot files (except the ones we care about)

etpinard · etpinard · commit 928ca0bdf51a · 2016-08-08T11:49:04.000-04:00
- so that devs can add their own e.g .editorconfig, .ackrc
  to their local repo and still `git add --all` if they want to.
diff --git a/.gitignore b/.gitignore
@@ -7,3 +7,9 @@ build/*
 !build/README.md
 
 npm-debug.log*
+
+.*
+!/.gitignore
+!/.npmignore
+!/.eslintrc
+!/.eslintignore
