Merge pull request #246 from patrickarlt/beta5

Testing and fixes for L.esri.Layers.FeatureLayer and associated classes
add sass for doc site
add small js file for docs site
add layouts for markdown and handlebars
add a header and footer for the docs site
stub out pages for the doc site
move examples into site > source > examples
move documentation to site > source > documentation
add sass-cache and site > build to gitignore
add assemble, sass, and a few other dependencies to package.json
set up Gruntfile.js with  task that starts a preview server and a watch task for developing doc
Merge pull request #249 from patrickarlt/beta5

Wrap up unit testing for L.esri.DynamicMapLayer and L.esri.BasemapLayer
Merge pull request #247 from paulcpederson/beta5

Stub out documentation site
fresh homepage
undo example thing
Merge pull request #251 from nikolaswise/beta5

microsite homepage
merge beta 5 work with docs site