Adding support to change only the visual mapping.
Merge remote-tracking branch 'blackheaven/master'

add visual-mode only trigger key
fix issue: :set indentkeys=0\,,0{
fix bundle file name with underline
fix .xpt comment syntax at bottom line
Merge branch 'master' of https://github.com/drmingdrmer/xptemplate

Conflicts:
        doc/tags