Added work-around for the EULA prompt on Firefox 2.0.0.20
Updated Firefox 15 > 15.0.1
Finally got around to silencing those sips/lion libpng errors
Added Firefox 16.0.1
Fixed incorrect short name for Firefox 16.0.1
Added missing fx16.png icon for Firefox 16.0.1

(Apologies, it's early, I forgot all the steps to add a new version in my haste!)
Replaced non-working fx16.png

._.
Added Firefox 17.0
Updated Firebug 1.10.2 > 1.10.6
Updated Firefox 17 > 17.0.1
Added Firefox 18.0
Updated Firefox 18.0 > 18.0.2
Removed unused `cp` command in `firefoxes.sh`
Removed additional `/` in Firefox Nightly ftp path
Allow specifying the install directory.
Remove unused var.
Add the slash I said to add in my directions.
Merge pull request #33 from plumlee/master

Allow specifying the directory for install.
Update README.markdown
Added Firefox 19.0