Added Quickstart section to README (closes #43)
add Log in thr Emitter GET and POST

It's better for debugging to know what data sent from the app
Added GET and POST logging in the Emitter, thanks @lixiaoyi! (closes #38)
Update to latest gradle tools and plugin
Remove unnecessary dependencies

Conflicts:
	snowplow-android-tracker/build.gradle
Updated to latest gradle tools and plugin, thanks @hamidp! (closes #39)
Fixed Gradle Dynamic Version linting warning (closes #46)
Targeted latest SDK version (21) (closes #47)