Move readme HTML parsing to a background thread.
Move readme HTML parsing to a background thread.

Some readmes can be very large and HTML parsing can take a lot of time
for those, therefore move as much parsing as possible into the
background. TextView.setText() will still take quite some time, but we
can't avoid that.

Bloody-Badboy/gh4a,slapperwan/gh4a,shekibobo/gh4a,edyesed/gh4a,AKiniyalocts/gh4a,sauloaguiar/gh4a,Bloody-Badboy/gh4a,DeLaSalleUniversity-Manila/octodroid-ToastyKrabstix,shekibobo/gh4a,shineM/gh4a,AKiniyalocts/gh4a,DeLaSalleUniversity-Manila/octodroid-ToastyKrabstix,sauloaguiar/gh4a,shineM/gh4a,slapperwan/gh4a,edyesed/gh4a