Remove sparkup plugin

Sparkup is not setup to be used with pathogen directly, I'm deleting
this submodule so that I can re-clone only the sub-directory containing
the files for vim.
added gitignore to ignore doc tags in submodules
added sparkup with new vim-specific git repo
re-activate sparkup submodule
Fix compatibility issue in sparkup by referencing python2 instead of python
Make default window size a bit smaller

My previous change to the default gVim window size was on a very big
screen and the windows were too big on my laptop so I made it a bit
smaller, but still bigger than the original.