adding support for blacklist
fixing error in cache write

Signed-off-by: Gabriel Andrade <gabriel@b-datum.com>
using regexp rules instead of bash-like wildcards for blacklist

Signed-off-by: Gabriel Andrade <gabriel@b-datum.com>
- README update for configurable path blacklist

Signed-off-by: Gabriel Andrade <gabriel@b-datum.com>
Merge branch 'blacklist'