Merge pull request #180 from Atheros1/master

Multi-core POW
Merge pull request #181 from Atheros1/master

Low priority POW threads
Merge pull request #182 from Atheros1/master

Increment version number to 0.3.2
debian build script improvements
Remove invalid characters from debian/changelog
Merge pull request #185 from Atheros1/master

initilize the ackdataForWhichImWatching data structure within the single worker thread
Merge pull request #184 from fuzzgun/master

Debian packaging improvements and fixes
Merge pull request #187 from Atheros1/master

 Emergency fix for 64-bit Windows systems
Merge branch 'master' of github.com:Bitmessage/PyBitmessage
Remove multi-core POW support