Merge pull request #62 from spark/master

removed unimplemented function examples
Merge pull request #63 from spark/master

added datasheets and updated shields
Merge pull request #64 from spark/master

added image placeholders for rc car
Merge pull request #65 from spark/master

updated sleep
Merge branch 'master' into gh-pages
Merge pull request #68 from spark/master

Updated SPI and I2C sections
Merge pull request #69 from spark/master

minor edit at the end
Merge pull request #70 from spark/master

updated TCP Client and Server examples
Merge pull request #71 from spark/master

updated relay shield example
Created a place to capture examples of successful API interactions with bash + jQuery
Merge branch 'gh-pages' of github.com:spark/docs into gh-pages