Some changes to improve this tool

[rsrdesarrollo]

Hi,

I have fix the next issues:

• safe flag was ignored (because it was redefined in local main environment)

I have add the next features:

• Allow POST data request: Using parameter -data you can now specify a payload for the POST request

• Allow custom headers Using parameter -header you can now overwrite and add new headers

• Add version Using -version parameter the program will show the version and exit.

Example: for example the command

hulk -safe -site http://localhost:8888 -headers "x-custom: lalala" -headers "accept-charset: utf-8" -data "da_my_post=data"

Will add custom header x-custom, overwrite accept-charset header (or other) and perform a POST with body "da_my_post=data"

[grafov]

@rsrdesarrollo thank you for this contribution! Sorry for later merging :)