Push mark when calling ycmd-goto

Pushing a mark makes it possible to jump back to the original location
by calling pop-tag-mark function.
Add new types to ycmd-parse-conditions
Merge pull request #61 from ptrv/push-mark-on-goto

Push mark when calling ycmd-goto
Merge pull request #62 from ptrv/fix-parse-conditions-variable

Add new types to ycmd-parse-conditions
Updated ycmd-server-command default to something more useful.