Merge branch 'filter1' into Constants

Conflicts:
	src/test/scala/breeze/linalg/LinearAlgebraTest.scala
Adjustments in convolve
toVector
Merge pull request #155 from ktakagaki/DenseVector

toVector
Merge pull request #154 from ktakagaki/filter1

Filter1
Merge remote-tracking branch 'remotes/origin/Constants'
Merge branch 'master' of https://github.com/ktakagaki/breeze