NERDTree can now optionally ignore the dot at the beginning of hidden
filenames for sorting to show them next to normal files if
`g:NERDTreeSortHiddenFirst` is set to 0. (By default it's set to 1 to
preserve the current behavior.) This is just like what GNU ls does when
`LC_COLLATE` environment variable is set to `en_US`.
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
On some new versions of vim these files were being loaded before the
main NERD_tree.vim which was causing errors as dependencies werent
loaded in time. Move the classes into lib - so vim wont try to load them
until we tell it
