zsh completion: more correctly omitting closing -p quote

If I have

$ sysdig -p '%fd.si

and I press TAB, I do not want

$ sysdig -p '%fd.sip'

Note the trailing '

This patch fixes this. Previously I switched to _describe from _alternative to
get this behavior, but that doesn't actually work (why did I think it did?).
We're now good except some pieces of the code use _describe and others use
_alternative. Would be good to be consistent, but it really doesn't matter
zsh completion: added new options in 0.1.85
bash completion: added new options in 0.1.85
Merge pull request #204 from dkogan/master

Tab completion updates
Try to install zsh completion under site-functions as well because Fedora uses that non-standard path as default
typo
When CMAKE_BUILD_TYPE is not specified, default to Release
test commit on sysdig
test commit on sysdig-private@capture-daemon
Merge remote-tracking branch 'origin/master' into capture-daemon
remove test files
Travis seems to have changed something and overrides the compiler anyway
echo_syslog chisel
missing include
more work on the echo_syslog chisel
Merge branch 'master' of github.com:draios/sysdig
typo
a couple more improvements to the echo_syslog chisel