updating summary and main core to match updated design

less function calls in, more detailed counts by types of checks

appended proper completion time to output
aesthetic correction
combined all hash generation and comparison into one primary method

integrated crc32 hashing as primary with sha256 as secondary fallback to
reduce processing per-item
bugfixes to get code to compile
updated readme to reflect recent code changes
added excludes array and implemented to walk logic
woops, missed a spot
updated option description
fixed some concurrency bugs and channel debug output problems