Merge pull request #37 from genn-team/Alan_Classifier_Work

Added IRIS classifier as a userproject
Fixed makefile issue when linking obj file

The makefile appears to treat the &> syntax as an instruction to run in the background rather than redirect all to file. This may only be an issue with some flavours of Linux
Merge pull request #38 from genn-team/fix-makefile-output-redirect

Fixed makefile issue when linking obj file
Merge pull request #39 from genn-team/master

pulled makefile fix from master