Add more robust .gitignore

Author: John Tuttle

.gitignore

@@ -1,15 +1,52 @@
-/.bundle/
-/.yardoc
-/Gemfile.lock
-/_yardoc/
+*.gem
+*.rbc
+/.config
 /coverage/
-/doc/
+/InstalledFiles
 /pkg/
 /spec/reports/
+/spec/examples.txt
+/test/tmp/
+/test/version_tmp/
 /tmp/
 
-# rspec failure tracking
-.rspec_status
-.byebug_history
+# Used by dotenv library to load environment variables.
+# .env
+
+## Specific to RubyMotion:
+.dat*
+.repl_history
+build/
+*.bridgesupport
+build-iPhoneOS/
+build-iPhoneSimulator/
+
+## Specific to RubyMotion (use of CocoaPods):
+#
+# We recommend against adding the Pods directory to your .gitignore. However
+# you should judge for yourself, the pros and cons are mentioned at:
+# https://guides.cocoapods.org/using/using-cocoapods.html#should-i-check-the-pods-directory-into-source-control
+#
+# vendor/Pods/
+
+## Documentation cache and generated files:
+/.yardoc/
+/_yardoc/
+/doc/
+/rdoc/
+
+## Environment normalization:
+/.bundle/
+/vendor/bundle
+/lib/bundler/man/
+
+# for a library or gem, you might want to ignore these files since the code is
+# intended to run in multiple environments; otherwise, check them in:
+Gemfile.lock
 .ruby-version
-.ruby-gemset
+.ruby-gemset
+
+# unless supporting rvm < 1.11.0 or doing something fancy, ignore this:
+.rvmrc
+
+.rspec_status