Reduce freeminecraft false positives

[rsh1]

This one was flagged: http://www.reddit.com/r/Minecraft/comments/2tga9y/really_need_purchase_help/cnys4n2

[Mustek]

Checked over the regex, minecraft.net returns as a positive. Crashlogs can also trigger these (net.minecraft.network)

Adding this to the beginning of the regex may fix this. (Needs verification + proper testing)
(?!minecraft\.net)

@aperson