Update README.md
Update pcbtool to show total number of pins/pads

pcbtool info <board_identifier> -v VARIANT will now report the total
number of through-hole vs smd devices as well as the total number of
surface mount pads and through hole pins for easy board quoting.
Remove debug print statement
Remove debug print
Fix mibtool to allow for parallel builds

For some reason on linux, invoking -j5 on mibtool (not mibtool.py)
caused the program to hang and need to be -9 killed.  Traced the
problem to running mibtool.py via an import mibtool call.

Replaced it by importing the MIBTool class and running it directly.
Merge pull request #63 from timburke/pr-mibtool-fix

Fix mibtool to allow for parallel builds
Merge pull request #62 from timburke/pr-pcbtool-update

Have pcbtool return smd pin and pad counts for assembly
Update README.md