Added search keywords: 
   has:(files,files,attachment,attachments), 
   (has,is):(flagged,starred|unflagged,unstarred|read,seen|unread,unseen),
   (larger,size,bigger,minsize): (10K|10M|10G),
   (smaller,maxsize): (10K|10M|10G)

Improved search (gmail special search X-GM-RAW)
Improved uids cache (reducing the number of cached tags)
Added nano scroller shadow