Fix the .ycm_extra_conf.py and SublimeText documentation.

There were a few broken links in the documentation and the provided
YCM template would not load properly in Sublime Text 3 on windows.

Lastly make the unit presubmit test pass on Windows too.

BUG=NONE
TEST=chromium.ycm_extra_conf_unittest.py

Review-Url: https://codereview.chromium.org/2039923002
Cr-Commit-Position: refs/heads/master@{#398330}
3 files changed