Adding log decorator to add message on device filesystem (for user problems debugging)
Updating ngcordova with lastest version (+ PR #326)
Updating generated css
Logs are now saved, on device, in a log file
Updating app logs with $log system, instead of raw console.log, and adding errorCallback on TileLayer MBTiles Plugin
Adding error log on plugin MBTiles call
Stringifying log message to have useful content when message is a JavaScript object
Log service is now independant from $log service, to resolve circular dependency when using $cordovaFile
Updating ngCordova + adding missing error callbacks in removeFile
Using finally instead of success callback on removeFile to write Logs
Doing string formatting AFTER msg stringify to avoid that sort of messages : "INFO: [Object object]"
Changing $log service to logging custom service in whole app
Merge branch 'master' into logging_system

Conflicts:
	app/scripts/app.js
	app/scripts/init/syncDataService.js
	app/styles/geotrek-mobile.css
	app/styles/geotrek-mobile.css.map
Some ionic css updates
Merge branch 'master' into logging_system
Adding comment on LOGS parameters