Changed configure --libdir to --appdir. Closes #1919.
Changed configure --libdir to --appdir. Closes #1919.

The --libdir option is retained for specifying where to put the Rubinius
shared library. We don't build a shared or static library yet but we will
when we have an embedding API.

The --appdir option specifies where the application runtime and library
files will be installed. The use of --libdir for this was misleading.

mlarraz/rubinius,heftig/rubinius,jemc/rubinius,ruipserra/rubinius,heftig/rubinius,heftig/rubinius,mlarraz/rubinius,ngpestelos/rubinius,jemc/rubinius,sferik/rubinius,ruipserra/rubinius,digitalextremist/rubinius,jsyeo/rubinius,kachick/rubinius,mlarraz/rubinius,dblock/rubinius,mlarraz/rubinius,mlarraz/rubinius,ruipserra/rubinius,digitalextremist/rubinius,Azizou/rubinius,dblock/rubinius,Wirachmat/rubinius,benlovell/rubinius,dblock/rubinius,pH14/rubinius,Wirachmat/rubinius,mlarraz/rubinius,Azizou/rubinius,jsyeo/rubinius,Azizou/rubinius,ruipserra/rubinius,ruipserra/rubinius,ngpestelos/rubinius,Wirachmat/rubinius,sferik/rubinius,ngpestelos/rubinius,benlovell/rubinius,kachick/rubinius,sferik/rubinius,jsyeo/rubinius,jemc/rubinius,sferik/rubinius,dblock/rubinius,benlovell/rubinius,digitalextremist/rubinius,pH14/rubinius,jemc/rubinius,Wirachmat/rubinius,Wirachmat/rubinius,kachick/rubinius,ngpestelos/rubinius,heftig/rubinius,sferik/rubinius,kachick/rubinius,heftig/rubinius,kachick/rubinius,sferik/rubinius,Azizou/rubinius,jsyeo/rubinius,mlarraz/rubinius,benlovell/rubinius,dblock/rubinius,ruipserra/rubinius,digitalextremist/rubinius,Azizou/rubinius,digitalextremist/rubinius,ngpestelos/rubinius,benlovell/rubinius,heftig/rubinius,pH14/rubinius,dblock/rubinius,Wirachmat/rubinius,Azizou/rubinius,jemc/rubinius,heftig/rubinius,Azizou/rubinius,ngpestelos/rubinius,digitalextremist/rubinius,jemc/rubinius,benlovell/rubinius,kachick/rubinius,jemc/rubinius,jsyeo/rubinius,pH14/rubinius,Wirachmat/rubinius,pH14/rubinius,ngpestelos/rubinius,ruipserra/rubinius,pH14/rubinius,dblock/rubinius,benlovell/rubinius,digitalextremist/rubinius,jsyeo/rubinius,kachick/rubinius,jsyeo/rubinius,sferik/rubinius,pH14/rubinius,kachick/rubinius