Adds bash completion to http command line interface.
Installing the script:
You can copy it to /etc/bash_completion.d/ (or something else on your
machine) and source it using following command
$ source /etc/profile
Now whenever you encounter a "-*" on your CLI, it presents you with the
options specified.
Couple of things that are still under work:
1) Adding this bash script to setup, so that user won't need manual
installation
2) Adding more options for HTTP (GET, PUT and so on) and other
options
