Add support for decrementing for-loops
Add a random function for the lulz.
Fixes for ruby 1.8.7 compatibilty.
Style nit.
Upgrade to listen 2.0.
Partially work around guard/listen#146.
make sass work with listen >= 1.1.0  < 2.2
cleanup and commenting
extend support to Listen ~>2.4
Change comparable()'s arguments from number_1, number_2 to number1, number2

    * Keep argument naming in line with other functions
    * Tests updated to reflect changes
Change documentation to reflect new names of comparable()'s arguments
percentage arguments changed from value to number

* tests updated to reflect change
Documentation uses 'number' instead of 'value' for percentage()
Change round()'s argument from 'value' to 'number'

* Updated test_round to reflect change in argument name
* Exception in assert_error_message - I did not change "$value: #cccccc is not a number for `round'" because the name of the class is used to create the error message.
Change from 'value' to 'number' in documentation for round()
Change ceil()'s argument from 'value' to 'number'

* Update tests to reflect changes
Change documentation for ceil() - 'number' instead of 'value'
Change floor()'s argument from 'value' to 'number'

    * Update tests to reflect changes
Change documentation for floor() - 'number' instead of 'value'
Change abs()'s argument from 'value' to 'number'

    * Update tests to reflect changes