Adding Debian example to brooklyn.properties.
Updated jboss logo. AS6 and AS7 entities updated to reflect change.
AutoScaler: calls listener if max size reached

- tracks the "unbounded pool size" (i.e. what it would be if there were
  no max pool size), and calls a listener if this goes above the
  max pool size for a sustained period of time
AutoScaler tidy: extract SizeHistory class
Fix REST's ConfigSummary.defaultVal serialization

- When config key's default value is not json serialisable, was getting
  500 errors.
- Fix by just sending String representation of the default value
AutoScalerPolicy: support reconfiguring config
AutoScalerPolicy: emit maxSizeReached sensor

- Instead of calling listener, emit a sensor event on the associated
  entity
AutoScalerPolicy maxSizeReached: incoroporate review comments
Merge pull request #514 from aledsage/feature/AutoScalerPolicy-notifyOnMaxReached

auto scaler policy emits notification-sensor on max pool size reached
Merge pull request #533 from jdtoy/master

jboss Entities logo refresh. Docs Debian regex example.
Adds EntityDriver.getEntity()
Supports customising installer downloads

- Adds DownloadsRegistry (a set of "resolvers" for figuring out
  the download URL, given an EntityDriver)
- Adds Attributes.DOWNLOAD_URL for the default download pattern
  of a given entity (where ${version} etc will get substituted)
Customise installer downloads through brooklyn.properties
DownloadsRegistry.resolve() returns List<String>

- Instead of returning a single string, return a list of URLs to
  try in-order
CommonCommands.downloadUrlAs improvements

- Cleans up CommonCommands.downloadUrlAs to support passiong in
  multiple URLs (to try each until one works), and for use in more
  simple download scenarios
- Adds tests
Use DownloadsRegistry in entity drivers

- Ands defines default DOWNLOAD_URL on each entity
Move EntityLocal from core to api project

- Requires removing EntityLocal.setAttribute(AttributeSensorAndConfigKey)
  because AttributeSensorAndConfigKey is a class in core
- EntityLocal is still in the package brooklyn.entity.basic so it
  shouldn't impact anyone's code (but it is ugly for the api project!)
- Also moves brooklyn.entity.trait.Configurable from core to api
Downloads registry: add javadoc
DownloadRegistry returns DownloadTargets

- Instead of just a list of strings, the DownloadTargets
  explicitly gives the "primary" and "fallback" URLs.
  This makes resolvers more composable.

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