Adds JcloudsLocation.SKIP_JCLOUDS_SSHING

- Config option to do all ssh’ing in brooklyn code, rather than
  configuring the jclouds TemplateOptions to setup the user.
- i.e. have jclouds return the VM, before we then execute the ssh
  commands for user setup/creation.
improve formatting of scheduler's status
add a new main.uri sensor in Attributes, similar idea but wider scope to WebAppService.ROOT_URL
enhance config REST data to provide info so that we get "open REST link" actions, and related cleanup
include parameters in description of effector invocations
call `parentLocation.release(child)` on unmanage, so that (in part) ports obtained for use on localhost are freed up for reuse;
and clean up how the decision to `release` is made with new abstract ProvisioningLocation
add support for extracting flags from $brooklyn:entitySpec declarations and translating them as config
apply code review comments, fixing whitespace and tidying a classname
This closes #273
Fix EntityExecutionManagerTest

- Failed in jenkins with “wrong” tasks being GC’ed.
- Aled speculates the two tasks terminated in the same millisecond,
  so introduce small delay between tasks and also log more info about
  tasks on error.
DynamicCluster: ensure cause of resize error is reported
Add TestApplication.newSimulatedLocation()
Bump TomcatServer version to 5.0.56
TestJavaWebAppEntity: tidies
TomcatAutoScalerPolicyTest: code tidy
Use Duration for AutoScalerPolicy.builder methods

- instead of taking long, take Duration parameter.
- for minPeriodBetweenExecs, resizeUpStabilizationDelay,
  resizeDownStabilizationDelay, and maxReachedNotificationDelay.
- Test tidy (for use of deprecated methods)
Fix Solr version number

- and uploaded solr-4.7.2.tgz to
  developers.cloudsoftcorp.com/brooklyn/repository/SolrServer/4.7.2/solr-4.7.2.tgz
Asserts: log.info with details of failure
BrooklynMavenArtifactsTest: allow retry for URL

- have seen response code 500 from repository.apache.org for snapshot
  builds, so retry for default timeout (30 seconds)
This closes #275