Use the builtin $signals array
[Fix #399] Only enable the main syntax highlighter
Update external completions
Update external syntax-highlighting
Update external history-substring-search
Remove no longer necessary key bindings
Fix misspellings of the word bellow in READMEs
Wrap errant long line in git module README
Correct typos in git module README
Merge branch 'master' of github.com:sorin-ionescu/prezto

Conflicts:
	modules/completion/external
	modules/syntax-highlighting/external