Adds export action to key manager allowing keys to be downloaded as .asc

Fixes #36
Cleans out displayPriv() and displayPub()
Fixes php code standard
Fix 'Message has not been send. Discard it?' on opening the key manager

Fixes #34
Moves patch line for #34; rcmail.env.compose_commands is only available if rcmail.env.action === "compose"
Makes HKP backend more proper
Merge remote-tracking branch 'upstream/master'

Conflicts:
	js/rc_openpgpjs.js
	rc_openpgpjs.php