6.1.beta4 is identical to the git "develop" branch, as usual. Tarball is 
here:

http://boxen.math.washington.edu/home/release/sage-6.1.beta4/sage-6.1.beta4.tar.gz

$ git log --oneline --author "Release Manager" 6.1.beta4 ^6.1.beta3
1a15a08 Trac #15192: add is_unit() for residue fields
aa5bbc9 Trac #8723: Change to return type of E.multiplication_by_m(m,True)
1d1e1e4 Trac #11630: Local data of elliptic curves should not do any global 
work
8a2f0f9 Trac #15609: IntegerVectors_nk.rank() specialization
edb1870 Trac #15559: Allow calling PARI's gcd and lcm with one argument
400e2fb Trac #11368: can't coerce pari to rational function field
0418a3e Trac #15619: Pickling of immutable graphs
dd71659 Trac #5153: bug in simon_two_descent  for elliptic curves
2820bfc Trac #2217: splitting field function for number fields
e43cc00 Trac #15549: Streamline construction of PARI objects
90ac26e Trac #15603: "immutable=True" for Graph/Digraph __init__ and copy()
4af8b39 Trac #15278: Hash and equality for graphs
1775d4a Trac #15551: Rename Graph.trace_faces to Graph.faces
d4a3706 Trac #13596: Improvements to IntegerMod is_square
fdaf2f6 Trac #13593: tighter upper bound on elliptic curve rank
4c2a75c Trac #15572: Exceptions when multiedges/loops are not supported
b5a31ff Trac #15441: Clean up ecl SIGCHLD configuration
87fc828 Trac #15588: Cleanup of integer_mod_ring.py
7919b93 Trac #11802: Generation of Lucas sequences modulo an integer
90516f9 Trac #7695: naming of the variable in subfields of cyclotomic fields
9c9a8c6 Trac #15292: matroids.Uniform(r,r) returns wrong matroid
fd76065 Trac #13771: Canonical Forms and Automorphism Groups of linear codes
fddd442 Trac #15516: Allow constant f in HyperellipticCurve
bf4dc37 Trac #15048: Tutorial: unclear/redundant text in `latex.rst`
075c388 Trac #15556: Convert Stein-Watkins database to git spkg format
9ec5abd Trac #15587: Package the git trac subcommand
b341657 Trac #14858: Type checks in arith.py
779807d Trac #11271: there is a serious bug in the documentation or code 
for is_surjective for

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