Update README.md: add color scheme 'Bubblegum'

I added the color color scheme 'Bubblegum' to increase the database of
color schemes that come pre-packaged with this Vim distribution. Similar
to Lucius.
Update vimrc: change default color scheme to Bubblegum
Update install.sh: add make command for vimproc.vim

Shougo's vimproc.vim plugin required the execution of a make command
within the plugin's folder, so I added that functionality.
Update install.sh: fix bugs and removes unecessary code
Bump version number to 1.0
Merge branch 'release-1.0'