cli.git: Better branch names maybe.

cli.git: Better branch names maybe.
zealot: use CI_BRANCH and set it in travis.
zealot.factor: Check against HEAD
.travis.yml: Travis seems to be terminating my command after the USING:.

[[
[0K$ ./factor -run=zealot.cli-changed-vocabs
io.pathnames
vocabs.loader
cli.git
modern
modern.out
modern.paths
modern.slices
sequences.extras
web-services.github
zealot.cli-changed-vocabs
zealot.factor
zealot

travis_time:end:155cd3d8:start=1530762416088842089,finish=1530762475370504525,duration=59281662436
[0K
[32;1mThe command "./factor -run=zealot.cli-changed-vocabs" exited with 0.[0m
travis_time:start:2ac2d2d0
[0K$ {:"./factor -run=zealot.cli-changed-vocabs | while read line ; do ./factor -e=\"USING"=>"kernel tools.test vocabs.hierarchy ; \\\"$line\\\" [ load ] [ test ] bi\" ; done"}
/home/travis/.travis/job_stages: line 78: {:./factor -run=zealot.cli-changed-vocabs | while read line ; do ./factor -e="USING=: No such file or directory

travis_time:end:2ac2d2d0:start=1530762475377510994,finish=1530762475383948090,duration=6437096
[0K
[31;1mThe command "{:"./factor -run=zealot.cli-changed-vocabs | while read line ; do ./factor -e=\"USING"=>"kernel tools.test vocabs.hierarchy ; \\"$line\\" [ load ] [ test ] bi\" ; done"}" exited with 127.[0m

Done. Your build exited with 1.
]]

zealot: test on cli.
travis: Load zealot so we can use it quickly twice. Also fetch origin/master so we can ``git diff`` against it.