This is for filename completion in the case of C-family include completion. The
path was being assembled incorrectly so os.isdir() was getting the wrong path
and then could not see was it a directory.
A few Completer methods that should have been forwarded to general completers
were not. This broke the identifier completer picking up the current identifier
right after it's typed in.
The issue was that AsyncCandidateRequestReady in the ultisnips completer would
always return false if there were no snippets for the current filetype, leading
to an infinite loop in CompletionsForQuery.
Fixes#270.
This was done by introducing a new ThreadedCompleter class that descends from
Completer. Both JediCompleter and FilenameCompleter descend from
ThreadedCompleter.
This implements the filename completer and introduces integration with
UltiSnips. The user will now see snippets in the completion menu. After
selecting a snippet, the user should invoke the UltiSnips trigger key
(which should be changed from the default of TAB) to trigger the snippet
expansion.
Fixes#77, Fixes#36
