Odd result for up-to-date branch

[sherm1]

Thanks, @SeanCurtis-TRI this works very nicely! I ran into a minor glitch (harmless though):

I ran git_cloc in a branch that was current with master. It crunched for 20s, then gave this output:

sherm@ubuntu:~/Documents/GitHub/sherm1/drake-distro2 (caching-base)$ git_cloc
Computing difference between $(git merge-base master HEAD) (5abc04c) and 'HEAD' (5abc04c).

2 errors:
Diff error (quoted comments?):  /tmp/aIReUKYBiS/tools/lint/test/formatter_test.py
Diff error (quoted comments?):  /tmp/Vm9eEig_tB/tools/lint/test/formatter_test.py
Category            added  modified  removed  
----------------------------------------------
code                0      0         0        
comments            0      0         0        
blank               0      0         0        
----------------------------------------------
TOTAL               0      0         0        

The final result is correct, though there seemed to be some agony getting there!