.gitignore: Remove obsolete files.
.gitignore: Remove obsolete files.

They are grunt-html-validation leftovers.

[ci skip]

Diaosir/ratchet,AladdinSonni/ratchet,arnoo/ratchet,coderstudy/ratchet,twbs/ratchet,ctkjose/ratchet-1,jamesrom/ratchet,AndBicScadMedia/ratchet,calvintychan/ratchet,Holism/ratchet,asonni/ratchet,hashg/ratchet,liangxiaojuan/ratchet,aisakeniudun/ratchet,vebin/ratchet,Artea/ratchet,guohuadeng/ratchet,leplatrem/ratchet,tranc99/ratchet,isathish/ratchet,youzaiyouzai666/ratchet,jimjin/ratchet,mazong1123/ratchet-pro,twbs/ratchet,youprofit/ratchet,Joozo/ratchet,mazong1123/ratchet-pro,jackyzonewen/ratchet,Samda/ratchet,cslgjiangjinjian/ratchet,wallynm/ratchet