Add WebKit nightly builds

version r159487 included in this commit
Merge pull request #30 from rolandwalker/webkit-nightly

Add WebKit nightly builds
rename dropbox to dropbox-experimental

fixes #29
Merge pull request #31 from rolandwalker/dropbox-experimental

rename dropbox to dropbox-experimental
Add GNU Emacs nightly builds

revision 24.3.50r115148 is included with this commit
Merge pull request #32 from rolandwalker/emacs-nightly

Add GNU Emacs nightly builds