Logging was calling wrong function name, could have crashed PZH

Jira Issue: WP-1069
change null/undef folder references to empty string

fixes exception on path.join with node.js 0.10, which doesn't allow any
other args than strings.

Jira-issue: WP-980
Merge pull request #15 from aldafu/WP-980-node-0.10-compatibility

change null/undef folder references to empty string
Add another piece of configuration data: invitation tokens

These tokens are used when inviting someone to join your personal
zone for the first time, and must be persistent.

Jira issue: WP-1064
Merge pull request #16 from jplyle/support-invite-tokens

Add configuration support for invitation tokens
Merge pull request #17 from habibvirji/master

Correct API call
Dynamic update webinos.js in Android

Jira Issue: WP-1029
Merge pull request #18 from ziransun/WP-1029

Dynamic update webinos.js in Android
Update configuration.js

Service Cache is not mandatory to be updated when PZP starts in Virgin mode, changes are in relation to that.
Android: Only append webinosocket.js in org.webinos.app/static/webinos.js

Jira Issue: WP-1029
Merge pull request #19 from ziransun/WP-1029

Android: Only append webinosocket.js in org.webinos.app/static/webinos.j...
wp-1083: Improve the interfaces to android-webinos
Merge pull request #20 from gguowei/wp-1083

WP-1083: Improve the interfaces to webinos-android
Load dashboard's wrt if exists.
Merge pull request #21 from cbotsikas/master

Load dashboard's wrt.
change to copy servicediscovery api tests as well

Jira-issue: WP-1119
Merge pull request #22 from aldafu/WP-1119-copy-disco-tests

change to copy servicediscovery api tests as well
WP-1083: Added a new file for platform interfaces
Merge pull request #23 from gguowei/wp-1083

WP-1083: Added a new file for platform interfaces
Merge remote-tracking branch 'upstream/master'

Conflicts:
	lib/loadservice.js