Initial commit
- bootimg-info based on unpackbootimg:
  https://github.com/CyanogenMod/android_system_core/tree/cm-11.0/mkbootimg
- show all info from the bootable image format header, in order, plus
extra info like base and offsets which are used in mkbootimg
- concept and output formatting based on bootimg-utils:
  https://github.com/trevd/android_external_bootimage_utils