Merge tag '0.9.1' into develop

0.9.1
Ignore npm-debug.log
Warn when image dimensions could not be computed
Fill in the readme
Correct typos in the readme
Accept `width`, `height`, `size` as function names
Remove modifiers and modifier automation
Ignore Sublime Text files
Refactor mapFunctions:
  unified interface for all functions,
  accepts multiple parameters.
Density parametre for dimensional functions
Inlining is now manual
Update README.md with the latest features
Merge branch 'feature/function-naming' into develop
Bump the version
Update all dependancies
Update README.md Grunt instructions
Merge branch 'release/1.0.0'