Merge pull request #18 from adeven/development

Version 2.1.0
Add logging for EventBuffering and DefaultTracker
Add documentation for pre-installed apps
Merge pull request #19 from adeven/development

Update version in pom.xml, update version to 2.1.1
sources and javadoc jars are being created
adds build.gradle
removing redundant variables and removing params from doc
introduces Constants
overrides, formatting, easier readability
allow easier setting of log level
continues cleanup
formatting
adds space
System.currentTimeMillis() instead of new Date...
Constants, Constants, Constants
aka less redundancy by removing redundancy
thou shalt not be overly accessible
introduces PackageType for easier type management
formatting
adds another missing space
introduces LogLevel wrapper