Fix change-version.sh

- previously excluded any file contain log or war, rather than
  just .log and .war
- previously excluded any file with "." in a dir on its path, 
  rather than just . at the start of dir name
Update version to 0.6.0-SNAPSHOT for missed files

- Adds BROOKLYN_VERSION marker to:
-- docs/use/guide/quickstart/catalog.xml
-- usage/dist/src/main/dist/conf/catalog.xml
-- util/jmx/jmxrmi-agent/src/main/java/brooklyn/util/jmx/jmxrmi/JmxRmiAgent.java

Note that for the first two, the path is to a snapshot repo
so the URLs will only work if the new version is for a snapshot
release!
Merge pull request #649 from aledsage/fix/version-bump-0.6.0-SNAPSHOT

Fix/version bump 0.6.0 snapshot