GoogleDrive: Start new Runtime. Utils, Loader: A way to load external script and have a callback called on load.

It will be able to upload from users GoogleDrive to webmasters server.
Utils, Basic: Add inParallel() method.

Similar to inSeries(), but load scripts in parallel, rather than in
sequence. Required to quickly retrieve file details from Google Drive.
FileInput, GoogleDrive: Add.
FileInput, GoogleDrive: Start fresh for every selection.
Blob/FileReader/XHR, GoogleDrive: Add.
Utils, Loader: Add a way to add attributes to script tag. And move from GoogleDrive to Core.
Utils, Loader: Fix file name in the header.
Runtime, GoogleDrive: Fix path to Loader module.
Dropbox: Add runtime.
FileReader, Dropbox: Add.
Blob/FileInput, Dropbox: Add.
Utils, Loader: Add interpolateProgress().

A way to get consistent and continuous progressing values from
standalone sources.
XHR, Dropbox: Add.
XHR, GoogleDrive: Intercept progress events and interpolate to achieve smoother feedback.
Merge branch 'cloud'. Add runtimes for GoogleDrive and Dropbox.