arida master first tag

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