Commits on Dec 7, 2015

1. Allow quitting with double Ctrl+D …

   I'm used to this feature from IPython/Jupyter and since here you also quit on empty string, I see no harm?
   
   Without this change, doing double Ctrl+D would get:
   
   ```
   th> Do you really want to exit ([y]/n)? /home.local/lucas/inst/src/torch/install/bin/luajit: ...ucas/inst/src/torch/install/share/lua/5.1/trepl/init.lua:587: attempt to index local 'line' (a nil value)
   stack traceback:
   	...ucas/inst/src/torch/install/share/lua/5.1/trepl/init.lua:587: in function 'repl'
   	.../src/torch/install/lib/luarocks/rocks/trepl/scm-1/bin/th:199: in main chunk
   	[C]: at 0x00406670
   ```

   

   lucasb-eyer committed Dec 7, 2015
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