Add Travis badge.
Merge pull request #72 from QuLogic/master

Add Travis badge.
Merge branch 'v0.12.x'

Conflicts:
	README.rst
New test for upcasting newints to floats.
Added upcasting test for complex numbers
Fixing upcasting behaviour for some operations on integers.
Some cleanup
Merge branch 'master' into v0.12.x
Bump version number to v0.12.4-dev and add a What's New section