Rename box snippet to boxp
Rename box snippet to boxp

Closes #1227.

vito-c/vim-snippets,honza/vim-snippets,phatograph/vim-snippets,adam-e-trepanier/vim-snippets,needle-wang/vim-snippets,phatograph/vim-snippets,craigp/vim-snippets,kevinkirkup/vim-snippets,vito-c/vim-snippets,craigp/vim-snippets,adam-e-trepanier/vim-snippets,needle-wang/vim-snippets,honza/vim-snippets,kevinkirkup/vim-snippets