simple README and some cleanup when makin

Makefile

 all:
 	python setup.py build_ext --inplace
+	rm -rf build

README.md

+# Fast R-CNN
+
+### Installation
+
+0. Extract the source code: `$ tar zxvf fast-rcnn.tgz`; call the source directory `$FRCNN`
+0. Build Cython modules: `$ cd $FRCNN && make` (there will probably be some benign warnings that you can ignore)
+0. Build Caffe: `$ cd $FRCNN/caffe-master` and follow the [Caffe installation instructions](http://caffe.berkeleyvision.org/installation.html)
+0. Establish symlinks for VOCdevkits
+  0. Symlink `$FRCNN/datasets/VOCdevkit2007` to where you have the PASCAL VOC 2007 devkit and data installed
+  0. And similiarly for other PASCAL VOC 20xy datasets
+  0. Symlink `$FRCNN/datasets/cache` to somewhere that will store cached dataset files
+ 
+### Usage
+
+Train a Fast R-CNN detector. For example, train a VGG 16 network on VOC 2007 trainval:
+
+`./experiments/train_net.py --gpu 0 --solver models/VGG_16/solver.prototxt --weights /data/reference_caffe_nets/VGG_ILSVRC_16_layers.v2.caffemodel`
+
+Test a Fast R-CNN detector. For example, test the VGG 16 network on VOC 2007 test:
+
+`./experiments/test_net.py --gpu 1 --def models/VGG_16/test.prototxt --net snapshots/vgg16_fast_rcnn_iter_40000.caffemodel`
+
+Test output is written underneath `$FRCNN/output`.

output/.gitignore

+*