ARQ-1601 More solid Android SDK tools lookup
ARQ-1602 Ignoring emulator process finish if with status 0

* This is a requirement for windows platform
ARQ-1600 Ability to EOF for process execution

* ProcessExecutor moved to standalone package to be more isolated
* ProcessExecutionException made a subclass of AndroidExecutionException
* Command API not propagated within classes anymore
* Simplied quoted string parsing by reusing Drone utilities
removed singleton creation from ProcessExecutor
repaired avd list output
replaced tabs to string format in toString methods
removed screenshooting support
escaped brackets in question while creating emulator from scratch
repaired typos in native readme
repaired Sentence.isEmpty()
repaired javadoc
increased timeout for web test, commented screenshooter test