Added rails4 plugin

plugins/rails4/rails4.plugin.zsh

+# Rails 4 aliases
+
+function _rails_command () {
+  if [ -e "script/server" ]; then
+    ruby script/$@
+  elif [ -e "script/rails" ]; then
+    ruby script/rails $@
+  else
+    ruby bin/rails $@  
+  fi
+}
+
+alias rc='_rails_command console'
+alias rd='_rails_command destroy'
+alias rdb='_rails_command dbconsole'
+alias rdbm='rake db:migrate db:test:clone'
+alias rg='_rails_command generate'
+alias rgm='_rails_command generate migration'
+alias rp='_rails_command plugin'
+alias ru='_rails_command runner'
+alias rs='_rails_command server'
+alias rsd='_rails_command server --debugger'
+alias devlog='tail -f log/development.log'
+alias rdm='rake db:migrate'
+alias rdr='rake db:rollback'
+alias rds='rake db:seed'
+alias rlc='rake log:clear'
+alias rn='rake notes'
+alias rr='rake routes'
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