~/.vimrc: Save and automatically restore sessions.

Stored in .project.vim for each project and with bindings `\ps` and
`\pl`. I like it! :)

Note the use of `:mksession!` (with `!`) and *not* using `<cr>` at the
end of the commands. This makes accidently overwriting previous
(precious) sessions less common.

.vimrc

@@ -131,6 +131,9 @@ noremap <c-r> q
"noremap k j
map q :quit<CR>
map Q :quitall<CR>
" save a 'project'
map <leader>ps :mksession! .project.vim
map <leader>pl :source .project.vim
" fancy maps
map <Space> :NERDTree<CR>
map <c-b> :make<CR> " build
@@ -192,3 +195,7 @@ let g:Powerline_symbols='fancy'
if getcwd() != $HOME && filereadable('.vimrc')
	source .vimrc
endif
if filereadable('.project.vim') && expand("%p") != ".git/COMMIT_EDITMSG"
	silent source .project.vim
endif