Unify .gitignore files

Author: alexeyr

.gitignore

@@ -1,7 +1,7 @@
-/.bundle/
+.bundle/
 /.yardoc
 /_yardoc/
-/coverage/
+coverage/
 /doc/
 /pkg/
 /spec/reports/
@@ -12,6 +12,8 @@
 /spec/examples.txt
 /spec/react_on_rails/dummy-for-generators/
 
+tmp/
+
 # RVM
 .ruby-version
 .ruby-gemset
@@ -23,6 +25,7 @@ node_modules
 yarn-debug.*
 yarn-error.*
 npm-debug.*
+.yarn-integrity
 
 /gen-examples
 
@@ -39,3 +42,21 @@ yalc.lock
 
 # TypeScript
 *.tsbuildinfo
+
+# Dummy app
+/spec/dummy/vendor/bundle
+/spec/dummy/db/*.sqlite3*
+/spec/dummy/log/**/*
+!/spec/dummy/log/.keep
+/spec/dummy/public/assets/
+/spec/dummy/public/webpack/
+/spec/dummy/spec/examples.txt
+
+# ReScript build files
+.merlin
+lib/bs/
+.bsb.lock
+*.res.js
+
+# Generated by ROR FS-based Registry
+generated