travis: run CodeSniffer to detect undefined variable usage
add <properties> tag to ruleset
show response exception message as a warning
enable SSL verification by default
extract duplicated request logic into a helper method
add back warning message
Merge pull request #823 from wp-cli/fix-823

Show warning if HTTPS request fails
update contributor list since 0.12.0
branding
set version to 0.12.1
test the waters before diving in
restrict codesniffer warnings to undefined variables
reset temporary $levs array on each iteration

also, use rsort(), since $levs isn't associative
remove unused $silent parameter from when cURL was used directly
remove unused $wpdb variable
fix undefined variables in comment.php
fix undefined variables in Formatter.php
fix undefined variables in scaffold.php
fix undefined variables in site.php
bump version to 0.13-alpha