~/.vimrc: Don't load rcodetools if they don't exist.

.vimrc

autocmd BufNewFile,BufRead *.java set include=^#\s*import
autocmd BufNewFile,BufRead *.java set includeexpr=substitute(v:fname,'\\.','/','g')
source ~/ruby-1.9.4dev/lib/ruby/gems/1.9.1/gems/rcodetools-0.8.5.0/rcodetools.vim
if filereadable('~/ruby-1.9.4dev/lib/ruby/gems/1.9.1/gems/rcodetools-0.8.5.0/rcodetools.vim')
	source ~/ruby-1.9.4dev/lib/ruby/gems/1.9.1/gems/rcodetools-0.8.5.0/rcodetools.vim
endif
" Plugin settings