Fix for AutoPairsJump bug and an extra option

Fixes issue #83

Also introduces a new option g:AutoPairsNormalJump that allows for the option of only doing a inoremap of g:AutoPairsShortcutJump.

For example, if I set g:AutoPairsShortcutJump to <c-f>, I can set g:AutoPairsNormalJump to 0 so that <c-f> is only mapped for jumping in insert mode. This will still allow <c-f> to be used for scrolling in normal mode.