Sync to CouchDB 1.4.0-rc.1
Do not build Fauxton by default
Improvements to Fauxton installation
Note how to get Rebar working
Install plugin (Rebar) dependencies
Support file:// Git repos for plugins
Standardize plugin names to satisfy Erlang

This is kind of a hack. Really the plugin author (or plugin authoring
tools) should not allow invalid names, or the name should be indicated
in the plugin package. (It kind of is though, in the .app file.)
Import pristine libtool-2.4.2 from http://ftpmirror.gnu.org/libtool/libtool-2.4.2.tar.gz
No more Git libtool
No more Git submodule for autoconf
Import pristine autoconf-2.69 from http://ftp.gnu.org/gnu/autoconf/autoconf-2.69.tar.gz
No more need to bootstrap libtool
Merge remote-tracking branch 'origin/master' into v1.4.0
Merge remote-tracking branch 'origin/libtool' into v1.4.0