Validate post length to prevent truncation
Validate post length to prevent truncation

closes #235

dungphanxuan/core,malayladu/core,falconchen/core,vuthaihoc/core,vuthaihoc/core,datitisev/core,kirkbushell/core,falconchen/core,jubianchi/core,jubianchi/core,dungphanxuan/core,kirkbushell/core,falconchen/core,renyuneyun/core,flarum/core,Onyx47/core,kidaa/core,zaksoup/core,Albert221/core,Albert221/core,Onyx47/core,Albert221/core,billmn/core,Luceos/core,Onyx47/core,billmn/core,flarum/core,kidaa/core,billmn/core,malayladu/core,datitisev/core,flarum/core,Albert221/core,zaksoup/core,kirkbushell/core,renyuneyun/core,zaksoup/core,renyuneyun/core,Luceos/core,datitisev/core,Luceos/core,renyuneyun/core,datitisev/core,vuthaihoc/core,Luceos/core,dungphanxuan/core,malayladu/core,kidaa/core,malayladu/core,kirkbushell/core