Update documentation

Signed-off-by: Claudio Matsuoka <cmatsuoka@gmail.com>
Add prepare_scan prototype to common header file

Signed-off-by: Claudio Matsuoka <cmatsuoka@gmail.com>
Add missing crc32 header file to dist package

Signed-off-by: Claudio Matsuoka <cmatsuoka@gmail.com>