Corrected digital signature on putDigitalSignature.

We had already corrected it on getDigitalSignature -- in
previous versions it was wrong.
Version bump to 0.1.3.2.
Merge branch 'master' of github.com:jgm/zip-archive
Version bump to 0.1.3.3
Cabal file improvements.

Moved source of library to src.
Put library in build-depends for executable and test suite.
Version bump to 0.1.3.4.
Version bump to 0.1.4.
Added OptDestination to ZipOptions.

Modified extractFilesFromArchive so that OptDestination will
be used as the base path, if given.