Inject 0.4.2-rc2 artifact release
queued 0.4.2 announcement, added 0.4.1 announcement, renamed files to be lowercase, because that is the right thing to do on the internet
updated building from source documentation
adds 0.4.2 final archive and makes it available for downloading
Merge pull request #247 from mattpowell/gh-pages

Adds v0.4.2 to injectjs.com
 update site rev to match latest (0.4.1 -> 0.4.2)
 update site rev to match latest (0.4.1 -> 0.4.2)
news post for 0.4.2 release