revise install script
fix github repos urls, add R dependencies installation, remove Pecan dependency, fix apache disable command
fix R dependencies installation
add nginx init scripts
add Centos support. Emded nginx init scripts.
don't be verbose
fix bundle installation
non-interactive nginx installation
fix epel installation for EL5. Increase robustness. Install narray before netcdf.
fix EL 5/6 epel urls
make the script mor reobust when launched with -xe; only install EPEL if it's not present
merge with upstream
Merge pull request #38 from burner1024/master

Fix install script commits