Merge pull request tinode#299 from Googlom/refactoring

remove unused opts parameter in adapter.OwnTopics method

mention HD and RW formatting

Merge pull request tinode#285 from BenisonSebastian/patch-1

Grammatical Documentation Correction

clarify usage of UserCacheReq

better error text

(cherry picked from commit a57701b)

small clarification

minify logo.svg

bump database version and provide db upgrade logic

update android screenshots

fix for maxresults being reset on adapter.Open()