Upgrade to JMH 1.4 and Java 7

There are two minor changes in addition to migrations to new API:

- Printed results use the proper Unicode `±` character to separate scores from errors.
- One constructor call now uses the new diamond operator to elide the explicit type argument.
Update Maven project name
Merge pull request #3 from tinkerware/jmh-1.4

Upgrade to JMH 1.4 and Java 7