upd-fix: fixing connection bugs in htmlboard

- fix: fixed client centric callback, to reduce the number of callback.
- upd: change the python bridge command line arguments and the call from
the board.
- upd: improve the python bridge with dynamic array for the pin layout.
- fix: fixed server centric htmlboard read function to work with the new
client connections.
- add: firmata_spi.hex.
- add: changelog.txt
fix: page path in "examples" projects

- fix: fixing page path in example projects for running at boot (autorun
mode).
- upd: added the link to the github page of the authors in some file.
- upd: changed the names of the sample files.
- add: added function for blinking a led on the board.
- add: added a 2 seconds fast blinking after board connection success.
fix: unix end of line format
fix: unix end of line format
Merge remote-tracking branch 'origin/v0.0.4'