LP#1392759 developer/packager Makefile.install targets

LP#1392759 developer/packager Makefile.install targets

* Adds <osname>-developer target for installing packages only needed by
  developers installing from source.  Currently, this is limited to
  packages needed for managing browser client dependencies, but others
  could be added later.

* Adds <osname>-packager target for installing packages needed to build
  Evergreen release bundles.

* Updates README install docs to reference these new targets.

* Updates README install docs to remove requirements for installing
  libtool/automake/autoconf, since those packages will have been
  installed during the OpenSRF install (which is required).

* NOTE: this does not include new Makefile.install targets for fedora

Signed-off-by: Bill Erickson <berickxx@gmail.com>