Update README.md
Update README.md
Update README.md
Merge pull request #22 from lauritzthamsen/travis

use travis-ci to test TraitClasses
Added travisci logo to README
Fix travis link

I don't know why there is an undefined at the end in the travis web interface, set the link to the build page [ci skip]
registry of all inclusions of classes into other classes, accessible as
singleton, as well as tests
TraitInclusion>>#= and test
possible to reevaluate a class description that includes parts of other classes
introduced InclusionDiffs and used those in >>#subclass:
to change including target class according to changes, which allows to
reevaluate and change class descriptions with includes:
includes: with selectors: and variables:
test for InclusionRegistry's diffing
simpler names for our test classes
fix for removing a variable that has previously been included
refactored InclusionRegistryTest
further test renamings
refactored our Class>>#subclass...-extension slightly
further refactored our inclusion->>#subclass:...
two test cases for issue #23
diffing of renamings of trait inclusions