Support long options

[Kaligule]

I love batsignal, it so fun to work with. Thank you.

In practice I assume that batsignal is likely to be used in a script of some sorts (and not being run manually on the commandline). Therefore I would prefer to use long options, because they are more readable and selfexplaining, especially If one doesn't have the manpage open right now. Saving space and time typing by using short options is not a concern in these cases.

Could batman start supporting long options?

Examples would include:

• -h = --help
• -v = --version
• -f = --full
• -W = --warning
• -C = --critical
• -D = --danger
• -f = --full
• -e = --expire