Josh Hoff 2fa35fb494 don't redefine user-defined mappings ... As a user it's a little jarring when a plugin maps over something I've already defined. This patch fixes that problem, by using `<unique>` to ensure unique mappings. For more info see `:help <unique>` Note: This has no effect if the mapping isn't already defined (that is, NERDTree is defining a unique mapping), so this won't break for normal users of the plugin. Note: `:silent!` is needed to ignore the error that occurs when a mapping is already defined. Fixes #252		2013-04-25 21:34:36 -05:00
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nerdtree	don't redefine user-defined mappings	2013-04-25 21:34:36 -05:00