Vehicle API Testbed: fixed file dependencies

Jira issue: WP-686
Vehicle Simulator: Fixed file dependencies and cleaned up code

Jira-issue: WP-686
Vehicle API Testbed: Fixed launching problem for integrated PDC app

Jira-issue: WP-686
Vehicle Testbed: Fixed dependencies in tripcomputer app

Jira-issue: WP-686
Simplified PZH/PZH certificate exchange within the same provider.

When connecting to another personal zone hub within the same
provider, avoid having to reauthenticate.

Jira issue: WP-687
Fix unwatch and remove for appstate sync

Unwatchig a property on a sync object now removes the watch listener.
Also fix reference counting for sync object. Reflect changes in updated
tests.

Jira-issue: WP-235
Minor fix: removing debug console.log entries from the sessionHandling code

Jira issue: WP-687
adding core PZP information API

jira issue: wp-227
Merge pull request #453 from jplyle/WP-687-Simplify-PZH-Cert-Exchange

Simplified PZH/PZH certificate exchange within the same provider.
Merge pull request #452 from aldafu/WP-235-improve-unwatch-and-remove-for-appstate-sync

Fix unwatch and remove for appstate sync
Fixed bug prevents sensors to stop

Jira issue: WP-736
Merge pull request #455 from glatorre/WP-736

Fixed bug prevents sensors to stop [WP-736]
Change use of object as key

Use the sessionId as a key instead.

Jira Issue: wp-737
Avoid corruption of unicode strings

The message is accumulated in string parts, which might break if the buffer boundary happens to be in the middle of a multi-byte char. Instead, accumulate the data in a buffer and convert it to a string when it has all been received.

Jira issue: wp-737
Implemented callbacks' propagation for sensors API

Jira issue: WP-738
Fixed bug in HTTP driver's configureSensor method

Jira issue: WP-738
Fix bug in callbackStorage

Jira issue: wp-748
Merge pull request #456 from TobyEalden/wp-737

Fix PZH message handling
Merge pull request #458 from TobyEalden/callback-fix

Fix bug in callbackStorage
Merge pull request #454 from krishnabangalore/wp-227_corePZPinformation

adding core PZP information API