Adding IEC unit property builders

[ptitjes]

Hi, thanks a lot for this library.

May I suggest adding the IEC names for units:

• 5.kibibyte instead of binaryKilobyte
• 5.mebibyte instead of binaryMegabyte
• gibibyte instead of binaryGigabyte
• etc.

[DeveloprOfThings]

This is a good suggestion. I will work on making this change.

[ptitjes]

So great! I will use your lib to remove my custom formating code in my app. <3

[DeveloprOfThings]

I've merged in IEC property builder rename. Thanks for the suggestion. If the current string formatting doesn't work, please create a new issue and describe an alternative. The current that I landed on was useful for my use-case and I didn't pay much attention to "standard" formatting.