[freebsd91p7][vim] 1. add VIM_TMP 2. replace vbookmark.vim 3. new map for vbookmark

1. Add new environment variable VIM_TMP for VIM temp dir
2. use my vbookmark.vim, based on showliu/vbookmark.vim to modify some thing
3. new map for vbookmark
	ma: clear all bookmarks in current file
	mA: clear all bookmarks in current group
	mR: reset vbookmark (clear any bookmarks)
	<f2>: move to next bookmark (in current file or in current
group)
	\<f2>: switch moving method; in current file or in current group

Hint: in vim, remove original "vbookmark.vim" dir manually and
":BundleInstall" again.
Merge branch 'freebsd91p7' of github.com:starleoda/env into freebsd91p7