added .gitignore
Merge pull request #108 from ilya-lavrenov:gitignore
Merge remote-tracking branch 'origin/2.4'
test data for Viz - Stanford Dragon, lena.png
added sanity data for insert/extract channels
Merge pull request #113 from ilya-lavrenov:tapi_channels
Merge pull request #116 from Nerei:viz_test_data