start on filter
Merge branch 'master' of https://github.com/scalanlp/breeze into filter1

Conflicts:
	src/main/scala/breeze/signal/package.scala
add hamming window and tests
sinc, sincpi
sinc/sinc tests
Sorry, git issues
David's suggestions
Merge pull request #120 from ktakagaki/filter1

Added sinc and sincpi, hamming window