add helium to Android.mk

Signed-off-by: Iliyan Malchev <malchev@google.com>
compile libhelium for Android

Signed-off-by: Iliyan Malchev <malchev@google.com>
helium: add the ability to set a language

Signed-off-by: Iliyan Malchev <malchev@google.com>
helium: add a test driver

Signed-off-by: Iliyan Malchev <malchev@google.com>
add support for the ratings file to helium and tesseract\'s simple test app

Signed-off-by: Iliyan Malchev <malchev@google.com>