fix installing issues

- replace '129.*' with '129.999' as suggested by JetBrains
bump version to v0.1.5
fix until-build number

- package got rejected with message: "Don't use 129.999 in "until-build", the build number of IDE can be more than 999. Use until-build="129.99999" instead."
fix issue with self signed / invalid ssl certs
add change detail panel

- show change details (incl. comments)
- minor layout optimizations
listing messages for changes is not supported in gerrit v2.6

- disable change messages for the moment (re-add when supporting 2.7)
bump version to v0.1.6
fix possible UnsupportedOperationException
Merge remote-tracking branch 'remotes/origin/master' into features/file-comments

Conflicts:
	src/main/java/com/urswolfer/intellij/plugin/gerrit/ui/GerritToolWindowFactory.java