Complete tap_surround.vim.

Add:
	vim/scripts/tap_surround.vim
		-Complete `tap_surround.vim`.
		-Add `s:ConfigurePlugin()`, to wrap any global-scope configuration
		statements.
		-Remove `s:CreateKeymaps()`'s nested keymapping functions, in favor of
		verbatim keymap creation statements (the special case accommodation for
		single-quotes was making the functions cumbersome).
Convert tap_surround.vim to TapSurround plugin.

Add:
	vim/(scripts/TapSurround/, bundle/TapSurround)
		-Rename `tap_surround` to TapSurround, and create a symlink to it from
		Pathogen's `bundle/` directory.

	vim/scripts/TapSurround/plugin/TapSurround.vim
		-Create main plugin file, to initialize variables and conduct any
		necessary configuration.

	vim/scripts/TapSurround/autoload/TapSurround.vim
		-Create an autoload file with the plugin's mapped
		element-insertion/deletion functions.