fix(ngdocs): use cdn version to generate link to source files

Closes #3616
Closes #3675
fix(ngTransclude): make the transclusion available to parent post-link

previously the translusion was appended the the ngTranslude element via
$evalAsync which makes the transluded dom unavailable to parent
post-linking functions. By appending translusion in linking phase,
post-linking functions will be able to access it.
fix(ngTransclude): clear the translusion point before transcluding

when the transluded content is being teleported to the translusion point, we should ensure that
the translusion point is empty before appending otherwise we end up with junk before the transcluded
content
fix(package.json): add a repository field

The `npm install` command complains about the missing repository field.

Closes #3674
fix(docs): fix diagram in tutorial/step_02

Removes whitespace before image tag as it caused it to be interpreted as a code block.

Closes #3668
fix($sce): allow IE7 standards mode to pass non-quirks mode test

Changes documentMode test version to 7 in order to support IE 8 in IE 7 standards
mode while still protecting against quirks mode.

documentMode returns the following values:
5 - quirks mode,
7 - IE 7 standards mode,
8 - IE 8 standards mode.

Closes #3633
Closes #3646