Support pass in absolute path, or just a bug?

[zw963]

When test failing, we can see a file path like this.

Then, we can copy it, and run it again with m.

m /home/zw963/Stocks/marketbet_crawler/test/stocks_test.rb:11
Failed loading test file:
cannot load such file -- .//home/zw963/Stocks/marketbet_crawler/test/stocks_test.rb
There were no tests found.

[searls]

Yeah, this keeps tripping me up too. Would welcome a PR to fix this for anyone who has time. @blowmage, interested?

[blowmage]

I'll take this.