add mask option and function to mask the src before generator
add tests for mask option
add some doc about masking in the README
add mask test with maskFile and mask options
add expected file for mask5 test
dont proceed to generator if src is empty
change meaning of 'true' in mask and add new keyword 'allowFirstLevel'
code style corrections
allow for 'allowLevel-1' 'allowLevel-2' and so on as mask value
remove maskFile option, allow mask to be a string, an object or an array of strings and objects
improve mask doc in README
Muliple changes:
- refactor some styles
- make options.mask parsed recursivly, allowing nested arrays
- allowLevel is an integer to allow for nested levels up to X
merge updates from master
update tests for boolean values
update maskAllowLevel to maskAllowUnknownLevels
Merge pull request #17 from MathiasPaumgarten/benib

Allow masking of files