Adding SHA-1/256 sum checks on exact file downloads
Adding a unit test and eval'ing Digest::SHA to make it optional
unit test sha-* check is also optional
do not specify Digest::SHA as a prereq
warn if SHA sums cannot be checked
use pure perl PkgConfig.pm when pkg-config is not available
update tests to work with alternate pkg-config
Merge pull request #61 from plicease/ppkg_config

use pure perl PkgConfig.pm if pkg-config is not available
add vikasnkumar as contributor
Merge pull request #60 from plicease/sha_checksum

Sha checksum