Merge pull request #16 from pedroscocco/master

Removed setDeviceIdentifier: as it is no longer in the SDK
Merge pull request #17 from pedroscocco/master

Updated .podspec requirements to match implementation of AnalyticsKitGoogleAnalyticsProvider
Only show one debug alert view at a time (prevent them from stacking up)
When logging an analytics kit event with a nil property or nil value
replace those with the string @"nil" to prevent crashes
set minimum iOS version to 5.0
updated NewRelic provider
updated minimum OS version to 6.0, updated Localytics sub spec to point to Localytics-AMP
NewRelic file type changed
bumped to 1.2
fixed Adjust and NewRelic dependencies
only synthesize weak alert property under ARC
added requires_arc
bumped version to 1.2.2
removed space from Provider Libraries folder to resolve framework linking issues
disabled Parse subspec
bumped to 1.2.3
added travis config
updated localytics to build from source
updated travis test config
template file for contributing