problems with UFunc.implictDoubleUTag
random constructors with tests
remove Int => Double implicit from UFunc, and put in explicit Int signatures where necessary
refactor UFuncs into subfolder
run tests when testing the root project.

closes #238
capability traits for SliceVector. Fixes #234
get rid of normcachedecorator
missed a spot?
update to LiteralRow to support arbitrary seas

fixes #227
Merge pull request #237 from ktakagaki/rand

random DenseVector/DenseMatrix constructors
Merge remote-tracking branch 'remotes/scalanlp/master' into padLeftRight