Docs: Fix typo
Fix GITLAB_ROBOTOLOGY style base addresses

Also remove GITLAB_ICUB style as it does no longer exist
added example code
link
gen-gh-pages: Do not build documentation for appveyor and travis branches
YCMInternal: Execute an echo instead of an empty command

The empty command introduced by 9d534b4c897c7b0f261ade629302771a0f43c624
that fixed #63 broke msvc builds, because apparently MSVC does not like
empty commands.

Therefore we actually perform an echo command, in order to make everyone
happy.
Generate documentation