#8 added PoC QuickSearch.jspa calling.

Only jql like inputs are handled.
Wanted to use OkHttp library by retrofit, but there is nasty unresolved for few months bug square/okhttp#184 which doesn't work very well when some parts (e.g. analytics library in that case) doesn't use him.
Fixed bug with calling quicksearch two times when using hardware keyboard ENTER button (key down and key up).
Extracted AuthorizationHeaderGenerator because it's used also with this QuerySearch call.
Merge branch 'master' into 8-quick-search-advanced
#8 handling not only "search for jql" responses but also "go straight to issue" type of response.

Cleaning, some logging, fallback to "text masterfield" search with quick search input
#8 loading indicators, empty view for issues list
updated dependencies