better toolchain links for now
'ScanMulti' returns units if one command succeeds

The previous behavior was for ScanMulti to fail if any of the scanners
returned an error.

Signed-off-by: Samer Masterson <samer@samertm.com>
Add LICENSE to readme

Also included: TLDRLegal summary link.
BSD
MIT (oops)
Merge pull request #31 from xizhao/patch-1

Add LICENSE to readme
Merge pull request #30 from samertm/master

'ScanMulti' returns units if one command succeeds
we have a full docs site now (srclib.org)
Don't complain if not run in a repo dir, and only check repo once
fix version print call
fix `go vet` issues