enhancements: new IR version and new version for tensor and Gorgonia

[owulveryck]

This should "partially fix" issue #175 (while waiting for a better way to handle version)

[codecov]

Codecov Report

Merging #176 into master will decrease coverage by 19.50%.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##           master     #176       +/-   ##
===========================================
- Coverage   87.11%   67.60%   -19.51%     
===========================================
  Files         395      511      +116     
  Lines       10454    17427     +6973     
===========================================
+ Hits         9107    11782     +2675     
- Misses       1156     5453     +4297     
- Partials      191      192        +1     

Impacted Files	Coverage Δ
backend/testbackend/onnx/onnx_test_abs.go	100.00% <ø> (ø)
backend/testbackend/onnx/onnx_test_acos.go	100.00% <ø> (ø)
backend/testbackend/onnx/onnx_test_acos_example.go	100.00% <ø> (ø)
backend/testbackend/onnx/onnx_test_acosh.go	100.00% <ø> (ø)
...ackend/testbackend/onnx/onnx_test_acosh_example.go	100.00% <ø> (ø)
backend/testbackend/onnx/onnx_test_add.go	100.00% <ø> (ø)
backend/testbackend/onnx/onnx_test_add_bcast.go	100.00% <ø> (ø)
...kend/onnx/onnx_test_argmax_default_axis_example.go	100.00% <ø> (ø)
...ckend/onnx/onnx_test_argmax_default_axis_random.go	100.00% <ø> (ø)
...tbackend/onnx/onnx_test_argmax_keepdims_example.go	100.00% <ø> (ø)
... and 612 more

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