fix remembering self-signed certs for hosts

- fix load logic (trusted hosts will be remembered after restart)
- save authority instead of host only (e.g. host:8080 instead of host)

Related to issue #25
restore Gerrit 2.6 support

- retrieving messages in change details is not supported

Related to issue #25
fix for self signed ssl connections

- fix escaping issues

Resolves issue #25
refactor / optimize review comment sink

- fix possible IllegalOperationException (Collections#emptyList)
- based on code by forrert
Merge remote-tracking branch 'remotes/uwolfer/master'

Conflicts:
	src/main/java/com/urswolfer/intellij/plugin/gerrit/ReviewCommentSink.java
	src/main/java/com/urswolfer/intellij/plugin/gerrit/rest/GerritUtil.java
	src/main/java/com/urswolfer/intellij/plugin/gerrit/rest/SslSupport.java
	src/main/java/com/urswolfer/intellij/plugin/gerrit/ui/GerritChangeListPanel.java
	src/main/java/com/urswolfer/intellij/plugin/gerrit/ui/diff/AddCommentAction.java
	src/main/java/com/urswolfer/intellij/plugin/gerrit/ui/diff/CommentForm.java
	src/main/java/com/urswolfer/intellij/plugin/gerrit/ui/diff/CommentsDiffTool.java
	src/main/java/com/urswolfer/intellij/plugin/gerrit/ui/diff/RemoveCommentAction.java