Allow certificate configurations to reference external files

This commit adds a function to the configuration.js module
to allow a pzh configuration to point to a file containing
a PEM certificate rather than forcing the PEM certificate
to be inside the JSON structure.  This will make it easier
to deploy the PZH Web Server without re-editing the
configuration files each time.

Jira issue: WP-965
Fixed prop messages schema

Added 'resp_to' as an optional field.

Jira-issue: WP-962
Fixed prop messages jasmine tests

Jira-issue: WP-962
Configuraiton changes to not set null and use undefined instead

Jira Issue: WP-961
split WebinosService into its own file

changes concatenation order when building webinos.js, the discovery code
now is at the very end. since the service modules need the WebinosService
interface, this code is split into its own file so it's availabe to them.

the call to instantiate the discovery is now also in webinos.servicedisco.js.

Jira-issue: WP-848
Merge pull request #3 from jplyle/make-loading-external-certificates-easy

Allow certificate configurations to reference external files
Merge pull request #4 from ccameroni/WP-962-fix-prop-messages-validation

WP-962 fix prop messages validation
Merge pull request #6 from aldafu/WP-848-split-servicedisco

split WebinosService into its own file
clean up

declare node_moduleDir once. add missing stat var declaration.

Jira-issue: WP-1002
Remove API test pages API that are not available.

When an API module is removed we now remove the test pages for that API.

Jira-issue: WP-1002
bump version to 0.8.2
Merge pull request #5 from aldafu/WP-1002-remove-testpages

Wp 1002 remove testpages