initial commit:
- set up repo
- remove Android.mk files
Fix compiles under Cygwin:
- import Makefiles from:
  http://github.com/huaixzk/unpackbootimg/
Patch mkbootimg:
- Revert *_offset switches to *addr
- Show all command switches in help

Patch unpackbootimg:
- Hide Android magic message if no issues
- Display ramdisk_addr always, second_addr and/or dt_size if they exist, and export them out to file
- Add support to split out second stage and/or dtb if they exist