Fixed #44

Added tablemode#logger#log && g:table_mode_verbose

Use logger wherever needed for logging general things, in future we can
scale this to do more things like write to a log file for debugging. It
uses g:table_mode_verbose to determine whether or not to actually log
the message.

autoload/tablemode/logger.vim

@@ -0,0 +1,5 @@
+function! tablemode#logger#log(message)
+  if g:table_mode_verbose
+    echom message
+  endif
+endfunction