Travis: improve script
ExternalProject: Always add a command to a step

Some generators (i.e. Xcode) will not generate a file target if no command
is set, and therefore the dependencies will be broken.
We set an echo command that does nothing to avoid this issue.
Update sha1sums
Travis: CMake is now installed by default on OSX
revision, added example etc
Update ycm-superbuild.7.rst

Added OS X documentation
Update ycm-superbuild.7.rst

Added newlines
Update ycm-superbuild.7.rst

Removed typos
extra bit of documentation
Merge pull request #65 from francesco-romano/master

Added OS X documentation to Superbuild section
Docs: Cleanup, fixes, and improvements
Docs: Fix typo
Fix GITLAB_ROBOTOLOGY style base addresses

Also remove GITLAB_ICUB style as it does no longer exist
Revert "ExternalProject: Always add a command to a step"

This reverts commit f49b11b1e5855b4eb729fd261a26c8f4e02c7ce6.