As usual, get the "develop" branch or the source tarball from 
http://www.sagemath.org/download-latest.html

Mini-changelog:

9d18e27 Updated Sage version to 6.7.beta1
2857ebf Trac #18205: mistune buggers up sage install
f4ee46d Trac #18075: Add inversion number method to AlternatingSignMatrices
bf3de47 Trac #12949: Better congruence testing for odd arithmetic subgroups
0442afc Trac #18206: transducers.Recursion: Improvement of the documentation
6109e22 Trac #18008: Periodic points for projective morphisms
1d082a0 Trac #17576: FreeModule.__contains__ is too lax in its test
b0f962b Trac #18140: Remove some global imports from all.py files
0ce9976 Trac #18200: Caching canonical_label in 
IncidenceStructure.is_isomorphic
d98d5ec Trac #18183: Implement two matroid polytopes
b1997b4 Trac #18179: Random generation of Ordered rooted trees
ecfdb45 Trac #18030: Clean-up stdsage.pxi includes
8445a7a Trac #17852: Cleanup in rings.arith and rings.integer
5c6392b Trac #17540: Poset.dimension
865aef6 Trac #10513: Coercion and category framework for modules
07fd773 Trac #18202: Six requires setuptools
c371fa6 Trac #18171: Update reference HKW2014
a1de863 Trac #18154: Documentation of 'bound' in 
IntegerModRing.random_element()
47af754 Trac #18147: Rank of int matrix, documentation typo
9006844 Trac #18177: Warning to Matrix.random()
4f0eb6b Trac #18165: Ref: add various missing modules to r/geometry
67172e0 Trac #18164: Ref: add various missing modules to r/coding
94b28f7 Trac #18146: typos in linear codes
cf335aa Trac #18160: IPython 3.1.0
8c9977c Trac #18040: Minimal polynomials of matrices over SymbolicRing
0e24974 Trac #17969: A tutorial on How to draw polytope in Tikz
bc225ec Trac #18193: Fix CompleteDyckWords_size behaviour for negative size
3619514 Trac #17855: create is_preperiodic function for points of 
projective space
4517e19 Trac #17580: Update sage_mode and fix autoload generation
90c4f22 Trac #17240: some rationals not in RIF (docu)
49a3203 Trac #15905: altermundus links are dead
ce02576 Trac #6837: Implementation of twisting modular forms by Dirichlet 
characters
e7fc07a Trac #18184: CombinatorialObject constructor should copy input
f0119fd Trac #18181: Move IntegerListsLex._Iter out of IntegerListsLex
b19f809 Trac #18178: fixing is_planar doc
3b669b7 Trac #18174: Generalize base class construction for functorial 
construction categories
77e14a9 Trac #13711: charpoly error on matrices with pi
6775212 Updated Sage version to 6.7.beta0

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