Fix building error: README is required by autotools

Signed-off-by: Bao Haojun <baohaojun@gmail.com>
Add option to ignore a dir with .beagrep-ignore

Signed-off-by: Bao Haojun <baohaojun@gmail.com>
submodule

Signed-off-by: Bao Haojun <baohaojun@gmail.com>
Fix beagrep compilation

Signed-off-by: Bao Haojun <baohaojun@gmail.com>
tools/beagrep: see system-config

Signed-off-by: Bao Haojun <baohaojun@gmail.com>
tools/beagrep-files: do more stuff in beagrep-unurl and rename it accordingly
tools/beagrep-unurl-and-filter.pl: also filter unwanted beagrep files

Signed-off-by: Bao Haojun <baohaojun@gmail.com>