Refactored GDAL formula to increase functionality

The usefullness of the GDAL library is limited by the number of formats it
supports.  In light of this, the formula has been re-worked to provide maximum
support for file formats without increasing the dependency list, with the
exception of common image formats such as JPEG and GIF.  Changes made in persuit
of this goal are:

- Removed libtiff as a dependency-- now provided by an internal GDAL library for
  support of the BigTIFF format.

- Added `jpeg` and `giflib` as dependencies to complete support for common image
  file formats.

- Enabled GDAL-native BSB, GRIB and PCRaster support.

- Added support for Expat, CURL, and Sqlite3 which are provided by OS X.

- Added support for `--HEAD` builds that compile from the gdal-dev source
  available via SVN.

Also, disabled drivers have been grouped according to open-source/proprietary
status.

Additionally, a `--complete` installation option has been added.  This option is
will trigger the installation of additional Homebrew formulae that increase the
capabilities of GDAL.  By specifying the `--complete` flag, GDAL will now depend
on and link against the following libraries in order to provide more drivers for
reading and writing data:

Raster Formats:

- HDF5
- NetCDF
- JasPer

Vector Formats:

- ODBC
- LibSpatialite
- Xerces-C

Support for database servers has been added via the `--with-postgres` and
`--with-mysql` flags.  These will cause PostgreSQL or MySQL to be added the
dependency list of GDAL.

Python bindings are now built by default as they provide ~18 additional command
line tools in addition to the Python module.  The formula ensures that these
bindings are installed into the Homebrew prefix and not some random Python site
directory.  Compilation of the bindings can be disabled by passing the
`--without-python` flag to `brew install`.

The Perl, PHP and Ruby bindings remain disabled as they install outside of the
Homebrew prefix.  Users may manually enable them at their discretion.  Getting
these bindings to install into the brew prefix is an area for further
development.

Finally, some cleanup of the configure options has occurred:

- Removed invalid configuration options.

- Fixed threading support.

Signed-off-by: Adam Vandenberg <flangy@gmail.com>

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