fixed typo in rails3 plugin and added one alias for migrating and redoing...

fixed typo in rails3 plugin and added one alias for migrating and redoing migration if it was successful

plugins/rails3/rails3.plugin.zsh

@@ -3,6 +3,8 @@ alias rg='ruby script/rails generate'
 alias rd='ruby script/rails destroy'
 alias rp='ruby script/rails plugin'
 alias rdbm='rake db:migrate db:test:clone'
+alias rdbmr='rake db:migrate && rake db:migrate:redo'
 alias rc='ruby script/rails console'
-alias rd='ruby script/rais server --debugger'
+alias rd='ruby script/rails server --debugger'
 alias devlog='tail -f log/development.log'
+