sync-over-wifi option is added, cloud-setting is made, sync using multiple accounts is added
language-code search, wifi-state dependent automatic sync, cloud-sync
status logging are implemented
ThumbRespeaking Activity now keeps only the last recording when recording is done in a row
Added JavaDocs
Merge pull request #372 from lisaslyis/search-interface

This resolves #245, #315, #344, #351, #355 and is related to #281, #358