Merge RubyMotion into Ruby

Ruby.gitignore

@@ -9,6 +9,11 @@
 /test/version_tmp/
 /tmp/
 
+## Specific to RubyMotion:
+.dat*
+.repl_history
+build/
+
 ## Documentation cache and generated files:
 /.yardoc/
 /_yardoc/

RubyMotion.gitignore

-.dat*
-.repl_history
-build/
-tags
-
-# Editor files
-.DS_Store
-nbproject
-.redcar
-*.swp
-*.swo
-~
-.eprj
-vendor/Pods
-*.nib
-
-# YARD artifacts
-.yardoc
-_yardoc
-doc/