Fixed invalid requests library version
App settings should be loaded on AirnotifierApp constructor

Otherwise the default values for settings are used and the airnotifier.conf file is ignored (so the database used is allways airnotifier instead the specified in airnotifier.con)
Checking existing app overwrites new app document definition
Moved settings loading code to correct place (so the messaging agents can be properly initializated)
Making a message payload compatible with Phonegap PushPlugin
Merge pull request #43 from jleyva/master

1. Parsing config file 
2. Fix request library version
3. Fix request parameter name