add noSize option: suppresses output of width, height, and scale only axis in tikz file. This is required for compatibility with the tikzscale package.
updated help to include 'noSize' option
moved conversion from px to in such that it is still executed when noSize option is set to true
Merge commit '6bd34d8d062d4b5e6367298389064b443b036068'
updated help
Merge pull request #336 from LJeub/master

noSize option