Prevent blocked words in generated hash

[jens-duttke]

The most Adblockers block resources if they contain specific words in the file name.

While creating hashes for file names, this should be considered to make sure, resulting files don't get blocked, because of their filename.

Some examples of blocked patterns from the popular EasyList filter list:

.120x600.
120-600.gif|
.160x600.
160x600.jpg|
.300x250.
.468x60.
700_200.jpg|
.clkads.
.cyad1.
.intad.
.internads.
.mobileads.
.nativeads.
.popupvideoad.
.refreshAds.
.rolloverad.
.sponsorads.
.streamads.
.textads.
.theadtech.
.topad.
.videoad3.
.videoad4.

For the above patterns, we can deduce that atleast /(ad|\d{2,}[x_-]\d{2,})/i should be avoided.

Children projection filters may also filter files if their name contains words like "sex", "porn", "p0rn", "fuck", "shit", "tits", "suck", "wank", "anal", "penis" etc.

I think this should be considered a problem, since the number of adblock users is very high:
https://www.quora.com/What-percent-of-internet-users-use-adblock