added paper reference to softsign layer.
added paper reference to softsign layer.

CVML/pybrain,ii0/pybrain,jackru/pybrain,sepehr125/pybrain,arabenjamin/pybrain,RafaelCosman/pybrain,jlegendary/pybrain,luigift/pybrain,tmeits/pybrain,zygmuntz/pybrain,jackru/pybrain,blueburningcoder/pybrain,jlegendary/pybrain,pybrain/pybrain,yonglehou/pybrain,Ryanglambert/pybrain,comepradz/pybrain,Adai0808/pybrain,Neural-Network/TicTacToe,CVML/pybrain,Adai0808/pybrain,yonglehou/pybrain,CVML/pybrain,blueburningcoder/pybrain,arabenjamin/pybrain,taylorhxu/pybrain,pybrain2/pybrain2,chanderbgoel/pybrain,ii0/pybrain,pybrain2/pybrain2,taylorhxu/pybrain,sepehr125/pybrain,tmeits/pybrain,arabenjamin/pybrain,comepradz/pybrain,styskin/pybrain,ii0/pybrain,zygmuntz/pybrain,Adai0808/pybrain,fxsjy/pybrain,jackru/pybrain,cmorgan/pybrain,pybrain/pybrain,newemailjdm/pybrain,zygmuntz/pybrain,fxsjy/pybrain,RatulGhosh/pybrain,chanderbgoel/pybrain,luigift/pybrain,cmorgan/pybrain,newemailjdm/pybrain,tmeits/pybrain,fxsjy/pybrain,chanderbgoel/pybrain,fxsjy/pybrain,styskin/pybrain,cmorgan/pybrain,RatulGhosh/pybrain,samstern/MSc-Project,newemailjdm/pybrain,luigift/pybrain,styskin/pybrain,Ryanglambert/pybrain,pybrain/pybrain,garyfeng/pybrain,Neural-Network/TicTacToe,yonglehou/pybrain,garyfeng/pybrain,RatulGhosh/pybrain,zygmuntz/pybrain,sepehr125/pybrain,RafaelCosman/pybrain,Neural-Network/TicTacToe,Ryanglambert/pybrain,garyfeng/pybrain,fxsjy/pybrain,blueburningcoder/pybrain,RafaelCosman/pybrain,jlegendary/pybrain,taylorhxu/pybrain,pybrain2/pybrain2,comepradz/pybrain