Remove deprecated --use-mirrors in pip command.
Merge pull request #1132 from chebee7i/coveralls

Remove deprecated --use-mirrors in pip command.
Use symmetric eigen solver in laplacian_spectrum
Merge pull request #1133 from ysitu/eigvalsh

Use symmetric eigen solver in laplacian_spectrum
git-core package name is obsolete for any supported version of debian or ubuntu
Merge pull request #1136 from alis0nc/master

git-core package name is obsolete for any supported version of debian or ubuntu. Closes #1135
Rework .travis.yml to use wheels.
Disable TravisCI email notifications.
Add handy hyperlink from tutorial to DiGraph class
Merge pull request #1139 from matt-hickford/patch-1

Add handy hyperlink from tutorial to DiGraph class
Add pygraphviz to .travis.yml
Update test_threshold.py

Fixes #1140
Install pygraphviz only for 2.x
Merge pull request #1129 from chebee7i/wheels

Use wheels with TravisCI for NumPy, etc. Closes #1137.
Merge branch 'master' into fiedler

Conflicts:
	.travis.yml
Install scikits.sparse in updated .travis.yml
Fix check for PyGraphviz in .travis.yml
Fix check for PyGraphviz in .travis.yml (cont'd)
Fix check for PyGraphviz in .travis.yml (cont'd)
Merge branch 'master' into fiedler

Conflicts:
	.travis.yml