* Change the default node delimiter to the BELL character, \x07.
* Syntax match by ASCII code, vs. string concatenation.
* Document the NERDTreeNodeDelimiter setting.
* Clean up the documentation markup.
* Remove apostrophes, since the NERDTree settings aren't vim options.
* Use backticks to hot-link the referenced vim options.
* Add a modeline.
* Update the title and the About section of the documentation.
* Fix typo, and clarify branches of code in Github.
* Fix wrapping to 78, and remove colorcolumn setting from modeline.
* Change the ASCI Art title, and give credit for it.
* Change the word option to setting, and redo the word wrapping.
I want to reserve the word 'option' to mean only Vim options that are
changed with the `:set` command. Since we need to use `:let` to
establish the values for the NERDTree variables, I choose to call them
settings instead.
* Realign hot-links with concealed markup tags taken into account.
* Text alignment, typo fixes, and wordsmithing the About section.
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