Explain how to get debug output with terminal vim

I found this through Valloric/YouCompleteMe#914, but it should probably be in the docs here.
Fixing race condition on server crash

Crash handling code tried to read stderr log file, but the file can be deleted
by the server befor we get to look at it. In such a case, we post a different
error message (without the log output).

Point is we do our best to get the error output if the user doesn't have
g:ycm_server_keep_logfiles set. If we can't get the logfile, oh well. We tell
the user to set that flag if they care.

Fixes #974.
Updating to latest ycmd
Merge pull request #975 from willsALMANJ/patch-1

Explain how to get debug output with terminal vim
Faster drawing of red diagnostic underlines

The new version of the regex executes faster.

Fixes #968.
GoTo commands now work when spaces in filenames

Fixes #977
Fixing links broken by ycmd split

Fixes #983.
Enable Function syntax for keyword seeding
Merge pull request #985 from davidjb/master

Enable Function syntax for keyword seeding
Removing clang_includes; now in ycmd repo
Updating to latest ycmd
use IPv4 to connect to ycmd
run_tests.sh only runs YCM tests, not ycmd ones
Travis badge now uses master branch

'travis' branch hasn't existed for months.
run_tests.sh now builds ycmd first

Needed to run the tests.
Updates to the README for recent C# support changes
Merge pull request #987 from fcelda/ycmd_ipv4

Use IPv4 to connect to ycmd
Merge pull request #991 from mispencer/ReadmeUpdateForCSharpImprovements

Updates to the README for recent C# support changes
Typo fix in readme
:YcmCompleter<TAB> now won't print traceback

If there's no semantic completer set for the current filetype,
:YcmCompleter<TAB> would print an ugly traceback. Ugh.

Fixes #989.