osx port

[alonbg]

backward compatible. relies on

• apt-get => brew
• sed => gsed + function wrapper
• arch => uname
• mktemp => function wrapper

[ddorgan]

@alonbg thanks for that! Will give this a test and let you know how it goes....

[ddorgan]

Thanks for the update. What's with the strange curl error??

$  curl https://get.parity.io -Lk -r stable
Warning: Invalid character is found in given range. A specified range MUST 
Warning: have only digits in 'start'-'stop'. The server's response to this 
Warning: request is uncertain.

[ddorgan]

Can you also add a brew install of the gnu-sed package. A default image does not have the command.