Support of filtering by regex

[AlexKorovyansky]

Please implement flag for filtering of logs by regex, like in Android Studio.

pidcat com.oprah.bees.android -f <regex-string>

Cheers!

[inteist]

pidcat com.oprah.bees.android | grep -E <regex-string>

and you are golden.

[frmz]

@inteist that will filter out the colors, also it gives some issue in some env like cygwin