Added limited disk cache for android template.

@drmillan I added two classes to complete a bit more the cache stuff functionality! =)
They are related to disk limit.

BTW, following your guidelines, I forked your repo, created a branch and so on. But I dont know why the branch is displayed in your repo instead of mine. Is it correct? or should I see the branch and PR (suggestion) on my github webpage repo instead?

Sorry If i did something wrong. 

@mrmans0n @kikogo @juanmatm82 @luismacb @awayo  Please, could take a look? Thanks in advance!
Thanks Nacho!