Add more keywords to ctags regex, plus README
update pcre
Merge pull request #5223 from wlbksy/pcre

Update pcre to 8.34
Merge pull request #5221 from brendano/master

Add more keywords to ctags regex, plus README
fix #5225
Merge branch 'master' of github.com:JuliaLang/julia
more thorough checking of type alias parameters. fixes #3601
fix #5210, factor() failing for some integer types