add Amplitude subspec
bump version
add Amplitude to Podfile, install from local
add AmplitudeProvider and necessary constants and imports
implement methods for subclass methods for AmplitudeProvider
add ifdefs to check amplitude exists
update changelog / add selfpraise
Merge pull request #18 from confidenceJuice/addAmplitude

Add amplitude
Merge branch 'master' into addHockeyAppNew

Conflicts:
	ARAnalytics.h
	ARAnalytics.m
	ARAnalytics.podspec
	Bootstrap/Podfile
	Providers/ARAnalyticsProviders.h