Special treatment for ESP8266 added that uses 10 bit resoultion in an…

…alogWrite() instead of 8 bit resoultion used on arduinos.

New release

 * No longer using floating point operations.

      Functions breathe, fade-on, fade-off are now implemented using
      linear approximations.
    * Changed method how fade-off is calculated
    * Made flickering workaround optional (see jled.cpp)

- fixed bug that last state was not calculated properly

- refactorings
- reformatted code
- new multi led example

 - refactorings

    - restructured tests
    - update catch.hpp testing framework
    - added user_param for user supplied brightness function
    - fixed bug that last state was not calculated properly
    - reformatted code

added missing keywords

fixed linting error