Pynq

This github tag is tied to the newly released [PYNQ-Z1 v1.4 SDCard image](https://s3-us-west-2.amazonaws.com/digilent/Products/PYNQ/pynq_z1_image_2017_02_10.zip)

Within that image file, PYNQ v1.4 is already installed. Updates to PYNQ since the last release include:
1. Python upgraded to 3.6.
2. Linux kernel upgraded to 4.6.0.
3. In base overlay, Programmable logic interrupt support added (i.e. PL can interrupt Python using asyncio).
4. In base overlay, Microblazes now have direct acccess to DRAM using High Performance (HP) ports.
5. Arduino_LCD18 class added.
6. Optimized mmio using numpy arrays.
7. Audio processing optimizations.

Note: Please upgrade to the v1.4 SDCard image before installing this version of PYNQ. We are leveraging new features in Python3.6 within the pynq package.

This release goes to public. New features include:
1. Exhaustive tests are done before the release.
2. Added notebook cells to free memory in many example notebooks.
3. Bug fixing on HDMI video sub-system.

This release is for the PennApps at University of Pennsylvania. New features:
1. Fixed bugs for grove devices on Arduino IO.
2. Added more documentation, starting steps, etc.
3. Support analog reads on Arduino analog channels. Added corresponding notebooks in examples.

This release is for OpenHW conference in Shanghai. Features:
1. Board environment: PYNQ-Z1. Retired Zybo.
2. More Pmod and grove devices are supported.
3. Arduino shield IO is supported.
4. Support video streaming from HDMI in to HDMI out at 1080p, 60Hz.
5. Support audio recording and playback.
6. More Jupyter notebooks on OpenCV, USB camera, USB WIFI, etc.
7. Documentation polished.

This release is for the hackathon at Polytechnic University of Milan. Features include:
1. Board environment: Zybo.
2. Implemented microblaze drivers for Pmod and grove devices.
3. Video streaming from HDMI in to VGA out.
4. Audio streaming from Audio in to Audio out.
5. Jupyter notebook examples uploaded.