Add GPL v3 license
travis-ci: add build-status image to readme
build: create a module for android-ndk-profiler

This creates a module that can be linked to a target library
by adding just 2 lines to the Android.mk file:

LOCAL_STATIC_LIBRARIES += android-ndk-profiler
$(call import-module,android-ndk-profiler)
Add copyright notices for GPL v3+
mcontext is not used anymore
Add -llog to the exported (required) libraries
timing-test: build updates

Remove timing-test build.xml file and use a custom_rules file to call
the ndk-build part. Add a bootstrap script to generate build.xml.
examples: add san-angeles example from ndk samples
example: update examples

Update patch for native activity

Use the module system for the example.

Update freeciv-android patch