Use Map interface instead of HashMap.

The diamond syntax <> is a Java 7 feature. It reduces some of
the verbosity of using generics.

Example:
Map<String> foo = new HashMap<String>();

is equivalent to

Map<String> foo = new HashMap<>();
Replace array literal
Dropping support for JDK 6 in Travis CI builds.
Merge pull request #2 from foobarman/dev

Some simple updates to APITest.java
Merge branch 'master' of github.com:lambdatronic/clj-span