Merge pull request v923z#151 from v923z/docs

fixed indentation error in approx.c

Merge pull request v923z#130 from v923z/argmin-fix

fixed argmin/argmax error in issue v923z#129

Merge pull request v923z#125 from v923z/openmv-fix

fixes compilation error in openmv

Merge pull request v923z#54 from v923z/readme

updated readme

Merge pull request v923z#5 from v923z/testing

Testing

updated conf.py