Added core
Added travisCI script
apply methods of BinOp and UnaryOp are removed and implemented directly inside Function
Added recurSubs and shifted subs to Term
Added case ** to diff and improved equals
Added reduceMinusAbs to CompositeTerm
Removed args from Term and AtomicTerm
Added expand method for multiplication
added expand method for power
Replaced flatnum with foldLeft
Remove -Xlint and add -deprecation to build.sbt
Merge pull request #1 from idlike2dream/simp

Core of Prime