closes #9
Merge commit 'cb4c0e9938bd1853eaa63e60e2bcf9d30d9b8470'
Merge commit '77f60ab87925e4a4903fa6bffe1052aa9de29f84'
fix parameter indexing
 * binCount can now be overridden
 * fix calculation of bin offset when histogram is calculated
* refactor metadata creation (using OperationrResource helper class)
* introduce value limits wherein to stretch
Merge commit '15581ee0611a4bb55d058b67d8db5b838654b459'
add method to stretch values by percent
Merge commit '4efd7b9a7067860aa5d5c50eee2bfe34d2c5084b'