Update gosrc data.

Add Go program to generate the data used by the package. Add go:generate
comment to invoke the program.

Update the data to Go 1.4 and the latest TLDs.
Upgrade to Bootstrap v3.3.1 and use a CDN
Merge pull request #211 from jayschwa/bootstrap-v3.3.1

Upgrade to Bootstrap v3.3.1
Enable source line links for googlesource.
Merge pull request #210 from garyburd/gosrcdata

Update gosrc data.
Get standard packages from golang.org.

Scrape golang.org to get source files for standard packages. Link
standard package documentation to the source files on golang.org.

Update to handle the new Go 1.4 directory structure with a fallback to
the Go 1.3 directory structure.
Merge pull request #213 from garyburd/googlesourcelinefmt

Enable source line links for googlesource.
Merge pull request #216 from garyburd/ghmove

Get standard packages from golang.org.
Enable package import comment redirect.

If the package import comment is specified and not equal to the current
path, then redirect to the path in the comment. See http://goo.gl/MBL1n6
for information about package import comments.
Delete unused code.

Delete the unused code for displaying hyper-linked source code for the
standard packages. The data file generator for the feature no longer
works because the generator was written to an old version of go/types.
If the feature is restored, then it should be written from scratch to
take advantage of oracle features.
Add flash messages.

Add support for displaying one-time notification messages on package
pages. This type of message is commonly called a "flash message."

Display a flash message when redirecting to the canonical path for a
package.

Change the package refresh handler to redirect back to the package page
with a flash message on error.