Change Repl enter hook behaviour
Change Repl enter hook behaviour

Evaluation is only started when pressing enter at the end of the buffer:
last line, last character. Otherwise a newline is inserted. Hopefully this
allows for more natural editing.

Fixes #70

emezeske/vimclojure,emezeske/vimclojure,kotarak/vimclojure,jgrocho/vimclojure,kotarak/vimclojure,jgrocho/vimclojure,emezeske/vimclojure,kotarak/vimclojure,jgrocho/vimclojure