Fix for MB-838 Unable to browse queues when user has a domain name

When the user name contains the domain name with the '/' character (eg: WSO2/admin),
queues can't be browsed from UI because the AMQP url generated for queue browsing
contains an invalid separator within the user name. Now this characters in
username field is escaped according to the URL standard using java.net.URLEncoder
Merge pull request #45 from Asitha/mb-838

Fix for MB-838 Unable to browse queues when user has a domain name
code cleanup
Merge pull request #46 from Asitha/mb-838

Code refa
Adding logs for MQTT port config reading error
Merge pull request #47 from a5anka/logging

Adding logs for MQTT port config reading error
Modify queue purge service to include owner name
Reformat and update POM files
Add new permission for queue/topic purging
Merge pull request #50 from a5anka/refactoring

Reformat and update POM files
Fix for https://wso2.org/jira/browse/MB-850

- If the admin role name is changed from user-mgt.xml this will be reflected in
  isAdminUser(...) check.

- Admin role name is now taken from current users userRealms admin role name
  rather than the hardcoded value "admin".
- everyone role name string is also taken from userRealm configuration instead of
  hardcoded value "everyone".
Fixed taking the admin role name from current user store configuration instead of taking
admin name from bootstrap user configuration to check whether a user has admin
privileges.
class level doc added for QueueManagerServiceImpl class
Hector based message store and context store implementation related changes
Merge pull request #53 from sperera/hector

Hector based message store and context store implementation related changes
Merge pull request #54 from Asitha/mb-850

Fix for https://wso2.org/jira/browse/MB-850
Merge pull request #51 from Asitha/class-doc-update

class level doc added for QueueManagerServiceImpl class
Merge pull request #49 from hastef88/queue_purge_feature

Modify queue purge service to include owner name
removed catching null pointers
Handled exceptions properly