proxy plugin: Fixed bug causing it to ignore the shutdown URL

[Closes #358]
Bumped version number to 0.4.3.2
Merge branch 'release/v0.4.3.2' into experimental
Restored dev version numbers and docs
HTML report: Fixed display of untrusted issues
Updated CHANGELOG
Added --http-username and --http-password options
Merge branch 'experimental' into v0.5