Update install.sh: add clang to base install

Signed-off-by: Michael LeCompte <michaelslec98@gmail.com>
Update vimrc: YouCompleteMe now compliled with --system-libclang

Signed-off-by: Michael LeCompte <michaelslec98@gmail.com>
Update README.md: add personal description

Signed-off-by: Michael LeCompte <michaelslec98@gmail.com>
Update vimrc: change --pdf to --module xelatex

Signed-off-by: Michael LeCompte <michaelslec98@gmail.com>