updated gap & libgap to 4.5.6
moved gap_packages to new build system, deleted braid package
provide a spkg-check to run the libgap testsuite
checked in the build scripts for the database_gap spkg
fix typo in version number
Merge remote-tracking branch 'trac/u/vbraun/gap-4.6.5' into gap_4_7_2

Conflicts:
	build/pkgs/gap/checksums.ini
	build/pkgs/libgap/checksums.ini
update to gap-4.7.2
upstream merged Jeroens cflags patch
udpate to libgap-4.7.2
Updated checksum for libgap spkg.
Trac #15532: upgrade networkx to version 1.8.1

Source Tarball: [[https://pypi.python.org/packages/source/n/networkx/net
workx-1.8.1.tar.gz|networkx-1.8.1.tar.gz]]

URL: http://trac.sagemath.org/15532
Reported by: ohanar
Ticket author(s): R. Andrew Ohana
Reviewer(s): Volker Braun
Trac #15511: upgrade rpy2 to 2.3.8

Source Tarball: [[https://pypi.python.org/packages/source/r/rpy2/rpy2-2.
3.8.tar.gz|rpy2-2.3.8.tar.gz]]

URL: http://trac.sagemath.org/15511
Reported by: ohanar
Ticket author(s): R. Andrew Ohana
Reviewer(s): Volker Braun
Trac #15512: upgrade sympy to version 0.7.4

Source Tarball: [[https://github.com/sympy/sympy/releases/download/sympy
-0.7.4/sympy-0.7.4.tar.gz|sympy-0.7.4.tar.gz]]

URL: http://trac.sagemath.org/15512
Reported by: ohanar
Ticket author(s): R. Andrew Ohana
Reviewer(s): Volker Braun
Trac #15582: Update to Gap 4.7.2

New tarballs:

* http://boxen.math.washington.edu/home/release/sage-6.1.beta3/upstream/
gap-4.7.2.tar.bz2
* http://boxen.math.washington.edu/home/release/sage-6.1.beta3/upstream/
gap_packages-4.7.2.tar.bz2
* http://boxen.math.washington.edu/home/release/sage-6.1.beta3/upstream/
database_gap-4.7.2.tar.bz2
* http://boxen.math.washington.edu/home/release/sage-6.1.beta3/upstream/
libgap-4.7.2.tar.gz

URL: http://trac.sagemath.org/15582
Reported by: vbraun
Ticket author(s): Volker Braun
Reviewer(s): Travis Scrimshaw