Update checker; documentation improvements (analogdevicesinc#154)

README: Describe 'models' data structure, clarify pyenv installation (a…

…nalogdevicesinc#140)

Remove distiller from synthesis project; update onnx package; update …

…README (analogdevicesinc#128)

* README: Add Centos/RHEL 8 instructions

Update SDK (analogdevicesinc#102)

Update to SDK with Feather support (analogdevicesinc#80)